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Encyclopedia > Equinox
UTC date and time of solstices and equinoxes
year Equinox
Mar
Solstice
June
Equinox
Sept
Solstice
Dec
day time day time day time day time
2002 20 19:16 21 13:24 23 04:55 22 01:14
2003 21 01:00 21 19:10 23 10:47 22 07:04
2004 20 06:49 21 00:57 22 16:30 21 12:42
2005 20 12:33 21 06:46 22 22:23 21 18:35
2006 20 18:26 21 12:26 23 04:03 22 00:22
2007 21 00:07 21 18:06 23 09:51 22 06:08
2008 20 05:48 20 23:59 22 15:44 21 12:04
2009 20 11:44 21 05:45 22 21:18 21 17:47
2010 20 17:32 21 11:28 23 03:09 21 23:38
2011 20 23:21 21 17:16 23 09:04 22 05:30
2012 20 05:14 20 23:09 22 14:49 21 11:11
2013 20 11:02 21 05:04 22 20:44 21 17:11
2014 20 16:57 21 10:51 23 02:29 21 23:03
Illumination of the Earth by the Sun on the day of equinox, (ignoring twilight).
Illumination of the Earth by the Sun on the day of equinox, (ignoring twilight).
The Earth in its orbit around the Sun causes the Sun to appear on the celestial sphere moving over the ecliptic (red), which is tilted on the equator (blue).
The Earth in its orbit around the Sun causes the Sun to appear on the celestial sphere moving over the ecliptic (red), which is tilted on the equator (blue).
Diagram of the Earth's seasons as seen from the north. Far right: December solstice
Diagram of the Earth's seasons as seen from the north. Far right: December solstice
Diagram of the Earth's seasons as seen from the south. Far left: June solstice
Diagram of the Earth's seasons as seen from the south. Far left: June solstice
Day arc at 0° latitude, equator
Day arc at 0° latitude, equator
Day arc at 20° latitude
Day arc at 20° latitude
Day arc at 50° latitude
Day arc at 50° latitude
Day arc at 70° latitude
Day arc at 70° latitude
Day arc at 90° latitude, pole
Day arc at 90° latitude, pole


In astronomy, equinox can have two meanings: An equinox in astronomy is the event when the Sun can be observed to be directly above the equator. ... ... “Summer solstice” redirects here. ... Image File history File links Download high resolution version (1560x1024, 392 KB) Illumination of Earth by Sun on the day of equinox (vernal and autumnal). ... Image File history File links Download high resolution version (1560x1024, 392 KB) Illumination of Earth by Sun on the day of equinox (vernal and autumnal). ... Image File history File links Download high resolution version (2000x1500, 289 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Equinox ... Image File history File links Download high resolution version (2000x1500, 289 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Equinox ... Image File history File links Download high resolution version (2000x1100, 213 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Equinox Season ... Image File history File links Download high resolution version (2000x1100, 213 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Equinox Season ... Image File history File links Download high resolution version (2000x1100, 193 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Equinox Season ... Image File history File links Download high resolution version (2000x1100, 193 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Equinox Season ... Image File history File links Download high resolution version (2000x1500, 296 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Equinox ... Image File history File links Download high resolution version (2000x1500, 296 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Equinox ... Image File history File links Download high resolution version (2000x1500, 278 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Equinox ... Image File history File links Download high resolution version (2000x1500, 278 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Equinox ... Image File history File links Download high resolution version (2000x1500, 283 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Equinox ... Image File history File links Download high resolution version (2000x1500, 283 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Equinox ... Image File history File links Download high resolution version (2000x1500, 289 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Equinox ... Image File history File links Download high resolution version (2000x1500, 289 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Equinox ... Image File history File links Download high resolution version (2000x1500, 247 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Equinox ... Image File history File links Download high resolution version (2000x1500, 247 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Equinox ...

  • The moment when the Sun is positioned directly over the Earth's equator and, by extension, the apparent position of the Sun at that moment - see below.

An equinox in astronomy is that moment in time (not a whole day) when the center of the Sun can be observed to be directly above the Earth's equator, occurring around March 20 and September 23 each year. In astronomy, a celestial coordinate system is a coordinate system for mapping positions in the sky. ... In astronomy, equinox can have two meanings: The moment when the Sun is positioned directly over the Earths equator and, by extension, the apparent position of the Sun at that moment - see Equinox. ... For other uses, see Astronomy (disambiguation). ... Sol redirects here. ... This article is about Earth as a planet. ... World map showing the equator in red In tourist areas, the equator is often marked on the sides of roads The equator marked as it crosses Ilhéu das Rolas, in São Tomé and Príncipe. ... is the 79th day of the year (80th in leap years) in the Gregorian calendar. ... is the 266th day of the year (267th in leap years) in the Gregorian calendar. ...


More technically, at an equinox, the Sun is at one of two opposite points on the celestial sphere where the celestial equator (i.e. declination 0) and ecliptic intersect. These points of intersection are called equinoctial points - the vernal point and the autumnal point. By extension, the term equinox may be used to denote an equinoctial point. The celestial sphere is divided by the celestial equator. ... The celestial equator is a great circle on the imaginary celestial sphere, which could be constructed by inflating the Earths equator until it intersects with said sphere. ... The plane of the ecliptic is well seen in this picture from the 1994 lunar prospecting Clementine spacecraft. ...


There is either an equinox (autumn and spring) or a solstice (summer and winter) on approximately the 21st day of the last month of every quarter of the calendar year. On a day which has an equinox, the center of the Sun will spend a nearly equal amount of time above and below the horizon at every location on Earth and night and day will be of nearly the same length. The word equinox derives from the Latin words aequus (equal) and nox (night). “Summer solstice” redirects here. ...


In reality, the day is longer than the night at an equinox. Commonly the day is defined as the period that sunlight reaches the ground in the absence of local obstacles. From Earth, the Sun appears as a disc and not a single point of light; so, when the center of the Sun is below the horizon, the upper edge is visible. Furthermore, the atmosphere refracts light; so, even when the upper limb of the Sun is below the horizon, its rays reach over the horizon to the ground. In sunrise/sunset tables, the assumed semi-diameter (apparent radius) of the sun is 16 minutes of arc and the assumed refraction is 34 minutes of arc. Their combination means that when the upper limb of Sun is on the visible horizon its center is 50 minutes of arc below the geometric horizon, which is the intersection with the celestial sphere of a horizontal plane through the eye of the observer. These effects together make the day about 14 minutes longer than the night at the equator, and longer still at sites towardMedia:Example.ogg the poles. The real equality of day and night only happens at places far enough from the equator to have at least a seasonal difference in daylength of 7 minutes and occurs a few days towards the winter side of each equinox. Look up day in Wiktionary, the free dictionary. ... A typical sunrise, in New Zealand A sunrise through clouds over Oakland, California. ... A composite image showing the terminator dividing night from day, running across Europe and Africa. ... This article is about an authentication, authorization, and accounting protocol. ... It has been suggested that arcsecond be merged into this article or section. ...

Contents

Names

  • Spring equinox and autumn or fall equinox. These names can be used when one wants to relate the equinox to a season. The seasons of the northern hemisphere and southern hemisphere are opposites (the spring equinox of one hemisphere is the autumn equinox of the other) so these names can be ambiguous.
  • March equinox and September equinox. An alternative to the previous set, but without the ambiguity for which hemisphere they are intended. These names are still not universal, however, as not all people on Earth use a solar-based calendar where the equinoxes occur every year in the same month (they differ in the Hebrew calendar, for example). The names are also not useful for other planets (Mars, for example), even though they have seasons.
  • Vernal equinox and autumnal equinox. These names are direct derivatives of Latin (ver = spring, autumnus = autumn), and as such more apt to be found in writings. Although in principle they are subject to the same problem as the spring/autumn names, their use over the centuries has fixed them to the viewpoint of the northern hemisphere. As such the vernal equinox is the equinox where the Sun passes from south to north, and is a zeropoint in some celestial coordinate systems. The name of the other equinox is used less often.
  • Vernal point and autumnal point. They are the points on the celestial sphere where the Sun is located on the vernal equinox and, respectively, on the autumnal equinox.
  • First point of Aries and first point of Libra. Alternative names for the previous set, but removing the problem that the vernal equinox may be dependent on a specific hemisphere. One disadvantage is that due to the precession of the equinoxes the astrological signs where these equinoxes are located, do not correspond any longer with the actual constellations.
  • Pisces equinox and Virgo equinox. Names to indicate in which constellations the two equinoxes are currently located. These terms are rarely used.
  • Northward equinox and southward equinox. Names referring to the apparent motion of the Sun at the times of the equinoxes.

For other uses, see Spring. ... This article is about the temperate season. ... Autumn colours at Westonbirt Arboretum, Gloucestershire, England. ... Northern hemisphere highlighted in yellow. ... southern hemisphere highlighted in yellow (Antarctica not depicted). ... The Hebrew calendar (‎) or Jewish calendar is the calendar used by Jews for religious purposes. ... Adjectives: Martian Atmosphere Surface pressure: 0. ... In astronomy, a celestial coordinate system is a coordinate system for mapping positions in the sky. ... Aries the animal Aries is an astrological sign that originated from the constellation Aries, and is the first sign of the zodiac. ... Libra is an astrological sign and is the seventh sign of the zodiac. ... The precession of Earths axis of rotation with respect to inertial space is also called the precession of the equinoxes. ... The term zodiac denotes an annual cycle of twelve stations along the ecliptic, the apparent path of the sun across the heavens through the constellations that divide the ecliptic into twelve equal zones of celestial longitude. ... This article is about the star grouping. ... For other uses, see Pisces. ... Virgo (pronounced , Latin: , symbol , ) is a constellation of the zodiac. ...

Solar terms in East Asia

Main articles: Chunfen and Qiufen

The traditional East Asian calendars divide a year into 24 solar terms (節氣, literally means "climatic segments"). Chūnfēn (pīnyīn) or Shunbun (rōmaji) (Chinese and Japanese: 春分; Korean: 춘분; Vietnamese: Xuân phân; literally: "vernal equinox") is the 4th solar term. It begins when the Sun reaches the celestial longitude of 0° and ends when it reaches the longitude of 15°. It more often refers in particular to the day when the Sun is exactly at the celestial longitude of 0°. In the Gregorian calendar, it usually begins around March 20 and ends around April 4 (April 5 East Asia time). Qiūfēn (pīnyīn) or Shūbun (rōmaji) (Chinese and Japanese: 秋分; Korean: 추분; Vietnamese: Thu phân; literally: "autumnal equinox") is the 16th solar term. It begins when the Sun reaches the celestial longitude of 180° and ends when it reaches the longitude of 195°. It more often refers in particular to the day when the Sun is exactly at the celestial longitude of 180°. In the Gregorian calendar, it usually begins around September 23 and ends around October 8. The Chinese character means division, so the vernal equinox and the autumnal equinox signify the middle of spring and autumn, respectively, unlike in Western cultures. 二十四節氣 solar terms 315° 330° 345° 0° 15° 30° 45° 60° 75° 90° 105° 120° 135° 150° 165° 180° 195° 210° 225° 240° 255° 270° 285° 300° The traditional East Asian calendars divide a year into 24 solar terms (節氣). ChÅ«nfÄ“n (pÄ«nyÄ«n) or Shunbun (rōmaji) (Chinese and... Source: JPL Horizons On-Line Ephemeris System The traditional East Asian calendars divide a year into 24 solar terms (節氣). QiÅ«fÄ“n (pÄ«nyÄ«n) or ShÅ«bun (rōmaji) (Chinese and Japanese: 秋分; Korean: ; Vietnamese: ; literally: vernal equinox) is 16th solar term. ... A Solar term is one of 24 days in the traditional East Asian lunisolar calendars that match a particular astronomical events or signify some natural phenomenon. ... Pinyin, more formally called Hanyu Pinyin (Simplified Chinese: ; Traditional Chinese: ; Pinyin: ), is the most common variant of Standard Mandarin romanization system in use. ... Japanese writing Kanji Kana Hiragana Katakana Hentaigana Manyōgana Uses Furigana Okurigana Rōmaji The romanization of Japanese is the use of the Latin alphabet (called rōmaji )   in Japanese) to write the Japanese language, which is normally written in logographic characters borrowed from Chinese (kanji) and syllabic scripts... Right ascension (RA; symbol α: Greek letter alpha; celestial longitude) is the astronomical term for one of the two coordinates of a point on the celestial sphere when using the equatorial coordinate system. ... For the calendar of religious holidays and periods, see liturgical year. ... is the 79th day of the year (80th in leap years) in the Gregorian calendar. ... is the 94th day of the year (95th in leap years) in the Gregorian calendar. ... is the 95th day of the year (96th in leap years) in the Gregorian calendar. ... Pinyin, more formally called Hanyu Pinyin (Simplified Chinese: ; Traditional Chinese: ; Pinyin: ), is the most common variant of Standard Mandarin romanization system in use. ... Japanese writing Kanji Kana Hiragana Katakana Hentaigana Manyōgana Uses Furigana Okurigana Rōmaji The romanization of Japanese is the use of the Latin alphabet (called rōmaji )   in Japanese) to write the Japanese language, which is normally written in logographic characters borrowed from Chinese (kanji) and syllabic scripts... Right ascension (RA; symbol α: Greek letter alpha; celestial longitude) is the astronomical term for one of the two coordinates of a point on the celestial sphere when using the equatorial coordinate system. ... For the calendar of religious holidays and periods, see liturgical year. ... is the 266th day of the year (267th in leap years) in the Gregorian calendar. ... is the 281st day of the year (282nd in leap years) in the Gregorian calendar. ...


Heliocentric view of the seasons

The Earth's seasons are caused by the rotation axis of the Earth not being perpendicular to its orbital plane. The Earth's axis is tilted at an angle of approximately 23.44° from the orbital plane. This tilt is called the obliquity of the ecliptic. As a consequence, for half a year (from around 20 March to around 22 September) the northern hemisphere tips toward the Sun, with the maximum around 21 June, while for the other half year the southern hemisphere has this honour, with the maximum around 21 December. The two instances when the Sun is directly overhead at the equator are the equinoxes. Also at that moment both the north pole and south pole of the Earth are just on the terminator, and day and night are divided equally between the hemispheres. This article or section is in need of attention from an expert on the subject. ... The Obliquity of the ecliptic is the angle between the plane of the Earths equator and the ecliptic plane in which the Earth rotates around the Sun. ... is the 79th day of the year (80th in leap years) in the Gregorian calendar. ... is the 265th day of the year (266th in leap years) in the Gregorian calendar. ... is the 172nd day of the year (173rd in leap years) in the Gregorian calendar. ... is the 355th day of the year (356th in leap years) in the Gregorian calendar. ... World map showing the equator in red In tourist areas, the equator is often marked on the sides of roads The equator marked as it crosses Ilhéu das Rolas, in São Tomé and Príncipe. ... World map with terminator (April) A composite image showing the terminator dividing night from day, running across Europe and Africa. ...


The table above gives the dates and times of equinoxes and solstices over several years. A few remarks can be made about the equinoxes: “Summer solstice” redirects here. ...

  • Because the Sun is a sphere and not a point source of light, the actual crossing of the Sun over the equator takes approximately 33 hours.
  • At the Equinoxes, the rate of change for the length of daylight and nightime is the greatest. At the poles, the Equinox marks the transition from 24 hours of nightime to 24 hours of daylight. High in the Arctic Circle, Longyearbyen, Svalbard, Norway has an additional 15 minutes more daylight every day around the time of the Spring equinox. Whereas, in Singapore, which lies virtually on the equator, the amount of daylight each day varies by just seconds.
  • It is 94 days from the June solstice to the September equinox, but only 89 days from the December solstice to the March equinox. The seasons are not of equal length because of the variable speed the Earth has in its orbit around the Sun.
  • The instances of the equinoxes are not fixed but fall about six hours later every year, amounting to one full day in four years, but then they are reset by the occurrence of a leap year. The Gregorian calendar is designed to follow the seasons as accurately as is practical. It is good, but not perfect. Also see: Gregorian calendar#Calendar seasonal error.
  • Smaller irregularities in the times are caused by perturbations of the Moon and the other planets.
  • Currently the most common equinox and solstice dates are 20 March, 21 June, 22 September and 21 December, the four year average will slowly shift to earlier times in the years to come. This shift is a full day in about 70 years (largely to be compensated by the century leap year rules of the Gregorian calendar). But that also means that as many years ago the dates of 21 March, 22 June, 23 September and 22 December were much more common, as older books teach and older people still remember.
  • Note that the times are given in UTC, roughly speaking, the time at Greenwich (ignoring British Summer Time). People living farther to the east (Asia, Australia) whose local times are in advance, will see the seasons apparently start later, for example in Tonga (UTC+13) an equinox occurred on 24 September 1999; a date which will not happen again until 2103. On the other hand people living far to the west (America) have clocks running behind in time, and may experience an equinox occurring as early as 19 March.

Longyearbyen Longyearbyen is the largest settlement on Svalbard, Norway and its capital. ... For the calendar of religious holidays and periods, see liturgical year. ... is the 79th day of the year (80th in leap years) in the Gregorian calendar. ... is the 172nd day of the year (173rd in leap years) in the Gregorian calendar. ... is the 265th day of the year (266th in leap years) in the Gregorian calendar. ... is the 355th day of the year (356th in leap years) in the Gregorian calendar. ... is the 80th day of the year (81st in leap years) in the Gregorian calendar. ... is the 173rd day of the year (174th in leap years) in the Gregorian calendar. ... is the 266th day of the year (267th in leap years) in the Gregorian calendar. ... is the 356th day of the year (357th in leap years) in the Gregorian calendar. ... ... This article is about Greenwich in England. ... is the 267th day of the year (268th in leap years) in the Gregorian calendar. ... This article is about the year. ... is the 78th day of the year (79th in leap years) in the Gregorian calendar. ...

Geocentric view of the seasons

The explanation given in the previous section would be useful for an observer in outer space. Seen from Earth, the explanation remains the same but the orientation changes. Now the Sun revolves in one year around the Earth. In the half year centered around June it rises and sets more towards the north, which means longer days and shorter nights for the northern hemisphere and shorter days and longer nights for the southern hemisphere. In the half year centred around December the Sun rises and sets more towards the south, and the day and night durations are reversed.


Also on the equinox day, the Sun rises, for every place on Earth (except at the poles), at 6:00 in the morning and sets at 18:00 in the evening local time. But these times are not exact for several reasons.

  • Most places on Earth use a time zone which is not equal to the local time, differing sometimes up to an hour or more, and even two hours if Daylight saving time (Summer time) is included. In that case, the Sun can rise for example at 8:00 and set at 20:00, but there would still be 12 hours of daylight.
  • Even those people fortunate enough to have their time zone just equal to the local time still will not see sunrise and sunset at 6:00 and 18:00, respectively. This is due to the variable speed of the Earth in its orbit, and is described as the equation of time. It has different values for the March and the September equinox (+8 and −8 minutes respectively).
  • Sunrise and sunset are commonly defined for the upper limb of the solar disk, and not for its centre. The upper limb is already up for at least one minute before the centre appears, and likewise the upper limb sets one minute later than the center of the solar disk.
  • Due to atmospheric refraction the Sun, when near the horizon, appears a little more than its own diameter above the position than where it is in reality. This makes sunrise more than another two minutes earlier and sunset the equal amount later. The two effects add up to almost seven minutes, making the equinox day 12h 7m long and the night only 11h 53m. In addition to that, the night includes twilight. When dawn and dusk are added to the daytime instead, the day would be almost 13 hours.
  • The above numbers are only true for the tropics. For moderate latitudes this discrepancy gets larger (London, for example: 12 minutes), and close to the poles it gets very large. Up to about 100 km from both poles the Sun is up for a full 24 hours on equinox day.
  • Height of the horizon on both the sunrise and sunset sides changes the day's length. Going up into the mountains will lengthen the day, while standing in a valley with hilltops on the east and the west can shorten the day significantly. This is why settlements in east-west running valleys are more favourable (daylight-wise) than north-south running valleys.

Timezone and TimeZone redirect here. ... Time zones are areas of the Earth that have adopted the same standard time, usually referred to as the local time. ... Although DST is common in Europe and North America, most of the worlds people do not use it. ... The equation of time is the difference, over the course of a year, between time as read from a sundial and a clock. ... Atmospheric refraction is the deviation of light or other electromagnetic wave from a straight line as it passes through the atmosphere due to the variation in air density as a function of altitude. ...

Day arcs of the Sun

Some of the above statements can be made clearer when picturing the day arc: the path the Sun tracks along the celestial dome in its diurnal movement. The pictures show this for every hour on equinox day. In addition, also some 'ghost' suns are indicated below the horizon, up to 18° down. The Sun in this area still causes twilight. The pictures can be used for both the northern and the southern hemisphere. The observer is supposed to sit near the tree on the island in the middle of the ocean. The green arrows give the cardinal directions. Diurnal motion is an astronomical term referring to the apparent daily motion of stars in orbit around the Earth, caused by the Earths rotation around its axis. ... For other uses, see Twilight (disambiguation). ...

  • On the northern hemisphere, north is to left, the Sun rises in the east (far arrow), culminates in the south (right arrow) while moving to the right and sets in the west (near arrow).
  • On the southern hemisphere, south is to the left, the Sun rises in the east (near arrow), culminates in the north (right arrow) while moving to the left and sets in the west (far arrow).

The following special cases are depicted. In astronomy, the culmination, at a given point, of a planet, star, constellation, etc. ...

  • The day arc on the equator, passing through the zenith, has almost no shadows at high noon.
  • The day arc on 20° latitude. The Sun culminates at 70° altitude and also its daily path at sunrise and sunset occurs at a steep 70° angle to the horizon. Twilight is still about one hour.
  • The day arc on 50° latitude. Twilight is almost two hours now.
  • The day arc on 70° latitude. The Sun culminates at no more than 20° altitude and its daily path at sunrise and sunset is at a shallow 20° angle to the horizon. Twilight is more than four hours, in fact there is barely any dark night.
  • The day arc at the pole. If it were not for atmospheric refraction, the Sun would be on the horizon all the time.

In broad terms, the zenith is the direction pointing directly above a particular location (perpendicular, orthogonal). ...

Celestial coordinate systems

The vernal point (vernal equinox) - the one the Sun passes in March on its way from south to north - is used as the origin of some celestial coordinate systems: In astronomy, a celestial coordinate system is a coordinate system for mapping positions in the sky. ...

Because of the precession of the Earth's axis, the position of the vernal point changes over time and as a consequence both the equatorial and the ecliptic coordinate systems change over time. Therefore, when specifying celestial coordinates for an object, one have to specify at what time the vernal point (and also the celestial equatorial) are taken. That reference time is also called equinox. The ecliptic coordinate system is a celestial coordinate system that uses the ecliptic for its fundamental plane. ... Ecliptic longitude (celestial longitude) is one of the co-ordinates which can be used to define the location of an astronomical object on the celestial sphere in ecliptic coordinates. ... The equatorial coordinate system is probably the most widely used celestial coordinate system, whose equatorial coordinates are: declination () right ascension () -also RA-, or hour angle () -also HA- It is the most closely related to the geographic coordinate system, because they use the same fundamental plane, and the same poles. ... Equatorial Coordinates Right ascension (abbrev. ... The precession of Earths axis of rotation with respect to inertial space is also called the precession of the equinoxes. ... In astronomy, equinox can have two meanings: The moment when the Sun is positioned directly over the Earths equator and, by extension, the apparent position of the Sun at that moment - see Equinox. ...


The autumnal equinox is at ecliptic longitude 180° and at right ascension 12h.


The upper culmination of the vernal point is considered the start of the sidereal day for the observer. The hour angle of the vernal point is, by definition, the observer's sidereal time. In astronomy, the culmination, at a given point, of a planet, star, constellation, etc. ... On a prograde planet like the Earth, the sidereal day is shorter than the solar day. ... In astronomy, an objects hour angle (HA) is defined as the difference between the current local sidereal time (LST) and the right ascension () of the object: HAobject = LST - object Thus, the objects hour angle indicates how much sidereal time has passed since the object was on the local... Sidereal time is time measured by the apparent diurnal motion of the vernal equinox, which is very close to, but not identical with, the motion of stars. ...


For Western tropical astrology, the same thing holds true; the vernal equinox is the first point (i.e. the start) of the sign of Aries. In this system, it is of no significance that the fixed stars and equinox shift compared to each other due to the precession of the equinoxes. Western astrology is the system of astrology most popular in Western countries. ... Aries the animal Aries is an astrological sign that originated from the constellation Aries, and is the first sign of the zodiac. ... The precession of Earths axis of rotation with respect to inertial space is also called the precession of the equinoxes. ...


In Hindu astrology on the other hand, their 'vernal equinox' was fixed to the stars about 17 centuries ago, and has been drifting away from the seasons since then, now amounting to 22 days. To meet Wikipedias quality standards, this article or section may require cleanup. ...


Cultural aspects

In the list below the terms March and September equinoxes are used when the celebration is fixed in time, while the terms spring and autumn equinoxes refer to those which are different in the two hemispheres.

  • The calculation of Easter in the Christian church (first Sunday after the first full moon on or after the March equinox), uses its own definition for the equinox — it always falls on March 21. The earliest possible Easter date in any year is therefore March 22.
  • The March Equinox marks the first day of various calendars including the Iranian Calendar and the Bahá'í calendar.[1] The Persian (Iranian) festival of Norouz is celebrated then. According to the ancient Persian mythology Jamshid, the mythological king of Persia, ascended to the throne on this day and each year this is commemorated with festivities for two weeks. These festivities recall the story of creation and the ancient cosmology of Iranian and Persian people. It is also a holiday for Azerbaijan, Afghanistan, India, Turkey, Zanzibar, Albania, and various countries of Central Asia, as well as among the Kurds. As well as being a Zoroastrian holiday, it is also a holy day for adherents of the Bahá'í Faith, and the Nizari Ismaili Muslims, commonly known as the Aga Khanis.
  • The September Equinox marks the first day of Mehr or Libra in the Iranian calendar. It is one of the Iranian festivals called Jashne Mihragan, or the festival of sharing or love in Zoroastrianism.
  • The spring equinox marks the Wiccan Sabbat of Ostara (or Eostar), while at the autumn equinox the Wiccan Sabbat of Mabon is celebrated.
  • In Japan, (March) Vernal Equinox Day (春分の日 Shunbun no hi) is an official national holiday, and is spent visiting family graves and holding family reunions. Similarly, in September, there is an Autumnal Equinox Day (秋分の日 Shūbun no hi).
  • Tamil and Bengali New Years follow the Hindu zodiac and are celebrated according to the sidereal vernal equinox (14 April). The former is celebrated in the South Indian state of Tamil Nadu, and the latter in Bangladesh and the East Indian state of West Bengal.
  • Earth Day was initially celebrated on March 21, 1970, the equinox day. It is currently celebrated in various countries on April 22.
  • In many Arab countries, Mother's Day is celebrated on the March equinox.
  • The September equinox was "New Year's Day" in the French Republican Calendar, which was in use from 1793 to 1805. The French First Republic was proclaimed and the French monarchy was abolished on September 21, 1792, making the following day the equinox day that year, the first day of the "Republican Era" in France. The start of every year was to be determined by astronomical calculation, (that is: following the real Sun and not the mean Sun as all other calendars).
  • The harvest festival in the United Kingdom is celebrated on the Sunday of the full moon closest to the September equinox.
  • The Mid-Autumn Festival is celebrated on the 15th day of the 8th lunar month, and is an official holiday in many East Asian countries. As the lunar calendar is not synchronous with the Gregorian calendar, this date could be anywhere from mid-September to early October.

Computus (Latin for computation) is the calculation of the date of Easter in the Christian calendar. ... This article is about the Christian festival. ... is the 80th day of the year (81st in leap years) in the Gregorian calendar. ... is the 81st day of the year (82nd in leap years) in the Gregorian calendar. ... The Iranian calendar (Persian: ), also known as Persian calendar or (mistakenly) the Jalāli Calendar is an astronomical solar calendar currently used in Iran and Afghanistan as the main official calendar. ... The Baháí calendar, also called the Badí‘ calendar, used by the Baháí Faith, is a solar calendar with regular years of 365 days, and leap years of 366 days. ... This article is about the Persian people, an ethnic group found mainly in Iran. ... Persepolis all nations stair case. ... Map of Zanzibars main island Zanzibar is part of Tanzania Coordinates: , Country Tanzania Islands Unguja and Pemba Capital Zanzibar City Settled AD 1000 Government  - Type semi-autonomous part of Tanzania  - President Amani Abeid Karume Area  - Both Islands  637 sq mi (1,651 km²) Population (2004)  - Both Islands 1,070... Map of Central Asia showing three sets of possible boundaries for the region Central Asia located as a region of the world Central Asia is a vast landlocked region of Asia. ... Languages Kurdish Religions Predominantly Sunni Muslim also some Shia, Yazidism, Yarsan, Judaism, Christianity Related ethnic groups other Iranian peoples (Talysh Baluch Gilak Bakhtiari Persians) The Kurds are an ethnic group who consider themselves to be indigenous to a region often referred to as Kurdistan, an area which includes adjacent parts... Zoroastrianism was adapted from an earlier, polytheistic faith by Zarathushtra (Zoroaster) in Persia very roughly around 1000 BC (although, in the absence of written records, some scholars estimates are as late as 600 BC). ... This article is about the generally recognized global religious community. ... The IsmāʿīlÄ« (Urdu: اسماعیلی IsmāʿīlÄ«, Arabic: الإسماعيليون al-IsmāʿīliyyÅ«n; Persian: اسماعیلیان Esmāʿīliyān) branch of Islam is the second largest part of the ShÄ«a community, after the Twelvers (Ithnāʿashariyya). ... This article is about the hereditary title. ... Mehr or Meher can mean several things: Mehr or Meher (in Persian: مهر) means sun and love. ... Look up Libra in Wiktionary, the free dictionary. ... The Iranian calendar (Persian: ), also known as Persian calendar or (mistakenly) the Jalāli Calendar is an astronomical solar calendar currently used in Iran and Afghanistan as the main official calendar. ... The following is a List of Festivals in Iran (Persia): // Nowruz: Celebration of the start of spring (Rejuvenation). It starts on the first day of spring (also the first day of the Iranian Calendar year) and lasts for 13 days. ... Mehregān (Persian:مهرگان) or Jashn-e-Mehregān is an ancient Iranian autumn festival, observed on the ninth or tenth of October, and dedicated in honor of Mehr, also known as Mithra, the Persian god of Light and Love. ... Zoroastrianism is the religion and philosophy based on the teachings ascribed to the prophet Zoroaster (Zarathustra, Zartosht). ... For other uses, see Wicca (disambiguation). ... In Neopaganism, the Wheel of the Year is the natural cycle of the seasons, commemorated by the eight Sabbats. ... Ostara is a modern Neopagan holiday. ... Mabon is one of the eight solar holidays or sabbats of American Neopaganism. ... Languages Tamil Religions Hinduism, Christianity, Islam, Buddhism, Jainism Related ethnic groups Dravidian people Brahui people Kannadigas Malayalis Tamils Telugus Tuluvas Gonds The Tamil people are a multi-ethnic group from the Indian subcontinent with a recorded history going back more than two millennia. ... The term zodiac denotes an annual cycle of twelve stations along the ecliptic, the apparent path of the sun across the heavens through the constellations that divide the ecliptic into twelve equal zones of celestial longitude. ... is the 104th day of the year (105th in leap years) in the Gregorian calendar. ... Tamil Nadu (தமிழ் நாடு, Land of the Tamils) is a state at the southern tip of India. ... , West Bengal (Bengali: পশ্চিমবঙ্গ Poshchimbôŋgo) is a state in eastern India. ... Earth Day Flag. ... is the 80th day of the year (81st in leap years) in the Gregorian calendar. ... Year 1970 (MCMLXX) was a common year starting on Thursday (link shows full calendar) of the Gregorian calendar. ... is the 112th day of the year (113th in leap years) in the Gregorian calendar. ... For other uses, see Arab (disambiguation). ... This article is about several worldwide days celebrating motherhood. ... This article is about the date January 1 in the Gregorian calendar. ... A French Revolutionary Calendar in the Historical Museum of Lausanne. ... Motto: (Liberty, equality, brotherhood, or death!) Anthem: La Marseillaise (unofficial) Capital Paris Language(s) French Government Republic Various  - 1792-1795 National Convention (rule by legislature)  - 1794-1799 Directory  - 1799-1804 First Consul Napoleon Bonaparte Legislature National Convention French Directory French Consulate History  - Storming of the Bastille/French Revolution 14 July... Kings ruled in France from the Middle Ages to 1848. ... is the 264th day of the year (265th in leap years) in the Gregorian calendar. ... 1792 was a leap year starting on Sunday (see link for calendar). ... In Britain, thanks have been given for successful harvests since pagan times. ... Japanese name Kanji: Kana: Korean name Hangul: Hanja: Vietnamese name Quốc ngữ: Chữ nôm: Mid-Autumn Festival celebrations in Victoria Park, Hong Kong. ... In lunar calendars, a lunar month is the time between two successive similar syzygies (new moons or full moons). ...

Trivia, facts and fables

  • For a Latin word like nox the plural is noctēs. Although this root is retained in English in the adjective: equinoctial — it is not commonly used for the plural, which is equinoxes, rather than equinoctes.
  • One of the effects of equinoctial periods is their temporary disruptive effect on communications satellites. For most geostationary satellites, there is almost always a point when the sun is directly behind the satellite relative to Earth. The Sun's immense power and broad radiation spectrum overload the Earth station's reception circuits with noise and, depending on antenna size and other factors, temporarily disrupt or degrade the circuit. The duration of those effects varies but can range from an hour to a few minutes.
  • Folk tales from various European countries claim that only on the March equinox day (some may add the September equinox day or may explicitly not), one can balance an egg on its point.[2][3][4] However one can balance an egg on its point any day of the year if one has the patience.
  • Although the word "equinox" implies equal length of day and night, as is noted elsewhere, this simply isn't true. For most locations on earth, there are two distinct identifiable days per year when the length of day and night are closest to being equal. Those days are commonly referred to as the "equiluxes" to distinguish them from the equinoxes. Equinoxes are points in time, but equiluxes are days. By convention, equiluxes are the days where sunrise and sunset are closest to being exactly 12 hours apart. This way, you can refer to a single date as being the equilux, when, in reality, it spans sunset on one day to sunset the next, or sunrise on one to sunrise the next. As an example, for a city 45°N and 123°W (Portland, Oregon), the 2006 autumnal equilux was on September 25 when sunrise was at 7:01 am and sunset was at 7:02 pm. The 2006 autumnal equinox was on September 22 at 9:03 pm (all times in Pacific Daylight Time). For the Northern Hemisphere, the autumnal equilux lags behind the equinox, and the reverse is true in the spring. As one might suspect, the whole situation is reversed for the Southern Hemisphere.[5]
  • It is perhaps valuable for people in the Americas and Asia to know that the equinoxes listed as occurring on March 21 that occurred frequently in the twentieth century and that will occur occasionally in the twenty-first century are presented as such using UTC, which is at least four hours in advance of any clock in the Americas and as much as twelve hours behind Asian clocks. Thus, there will be no spring equinox later than March 20 in the Americas in the coming century.[citation needed]

Image File history File links Broom_icon. ... In grammar, an adjective is a word whose main syntactic role is to modify a noun or pronoun (called the adjectives subject), giving more information about what the noun or pronoun refers to. ... Look up plural in Wiktionary, the free dictionary. ... U.S. military MILSTAR communications satellite A communications satellite (sometimes abbreviated to comsat) is an artificial satellite stationed in space for the purposes of telecommunications using radio at microwave frequencies. ... Nickname: Location of Portland in Multnomah County and the state of Oregon Coordinates: , Country State Counties Multnomah County Incorporated February 8, 1851 Government  - Mayor Tom Potter[1]  - Commissioners Sam Adams Randy Leonard Dan Saltzman Erik Sten  - Auditor Gary Blackmer Area  - Total 376. ... is the 268th day of the year (269th in leap years) in the Gregorian calendar. ... is the 265th day of the year (266th in leap years) in the Gregorian calendar. ... PDT is UTC-7 The Pacific Time Zone observes standard time by subtracting eight hours from Coordinated Universal Time (UTC-8). ... is the 80th day of the year (81st in leap years) in the Gregorian calendar. ... (19th century - 20th century - 21st century - more centuries) Decades: 1900s 1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s As a means of recording the passage of time, the 20th century was that century which lasted from 1901–2000 in the sense of the Gregorian calendar (1900–1999... (20th century - 21st century - 22nd century - other centuries) Definition In calendars based on the Christian Era or Common Era, such as the Gregorian calendar, the 21st century is the current century, as of this writing, lasting from 2001-2100. ... UTC redirects here. ... is the 79th day of the year (80th in leap years) in the Gregorian calendar. ...

References

  1. ^ Baha'i calendar
  2. ^ Infernal Egguinox
  3. ^ Standing an egg on end on the Spring Equinox
  4. ^ Equinox Means Balanced Light, Not Balanced Eggs
  5. ^ sci.astro equilux discussion

See also

A cross-quarter day is a day falling halfway between one of the four main solar events (two solstices and two equinoxes) and the next one. ... Setsubun, Tokuan shrine In Japan, Setsubun (節分) is the day before the beginning of each season. ... The precession of Earths axis of rotation with respect to inertial space is also called the precession of the equinoxes. ... “Summer solstice” redirects here. ...

External links


  Results from FactBites:
 
Equinox Perm ® Kennels - Dobermans and Miniature Pinschers, B.C. Canada (461 words)
Equinox Perm ® Kennels - Dobermans and Miniature Pinschers, B.C. Canada
To hold a living creature, to see its loveliness and to breathe in that sweet puppy breath, to feel its heart beat in your hands, to know its trust in you, is to understand the special bond between a puppy and its breeder.
When we buy a pet or even shop at a store that sells puppies, we contribute to a heartless underground industry that forces dogs to spend their entire lives in cages constantly breeding to support consumer demand for puppies.
Equinox - Wikipedia, the free encyclopedia (2972 words)
As such the vernal equinox is the equinox where the Sun passes from south to north, and is a zeropoint in some celestial coordinate systems.
The vernal equinox, the one the Sun passes in March on its way from south to north has a special significance in astronomy as it marks the origin of both ecliptic coordinates and equatorial coordinates, and also the start of the sidereal day.
The spring equinox marks the Wiccan Sabbat of Ostara (or Eostar), while at the autumn equinox the Wiccan Sabbat of Mabon is celebrated.
  More results at FactBites »

 
 

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