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Encyclopedia > Solar calendar

A solar calendar is a calendar whose dates indicate the position of the earth on its revolution around the sun (or equivalently the apparent position of the sun moving on the celestial sphere). A page from the Hindu calendar 1871-72. ... The celestial sphere is divided by the celestial equator. ...

Contents

Tropical solar calendars

If the position of the earth (or the sun) is reckoned with respect to the equinox, then the dates indicate the season (and so is synchronized to the declination of the sun). Such a calendar is called a tropical solar calendar. Illumination of the Earth by the Sun on the day of equinox, (ignoring twilight). ... This article or section is in need of attention from an expert on the subject. ... In astronomy, declination (abbrev. ... The Sun is the star at the center of the Solar System. ...


The mean calendar year of such a calendar approximates some form of the tropical year (typically either the mean tropical year or the vernal equinox year). A tropical year is the length of time that the Sun, as viewed from the Earth, takes to return to the same position along the ecliptic (its path among the stars on the celestial sphere). ...


The following are tropical solar calendars:

Every one of these calendars has a year of 365 days, which is occasionally extended by adding an extra day to form a leap year. The Gregorian calendar is the most widely used calendar in the world. ... The Julian calendar was introduced in 46 BC by Julius Caesar and came into force in 45 BC (709 ab urbe condita). ... 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. ... The Coptic calendar, also called the Alexandrian calendar, is used by the Coptic Orthodox Church. ... The Iranian calendar (Persian: ‎) also known as Persian calendar or the Jalāli Calendar is a solar calendar currently used in Iran and Afghanistan. ... Malayalam calendar (also known as Malayalam Era or Kollavarsham) is a solar Sideral calendar used in the state of Kerala in South India. ... It has been suggested that Puthandu be merged into this article or section. ... The Thai solar, or Suriyakati (สุริยคติ), calendar is used in traditional and official contexts in Thailand, although the Western calendar is sometimes used in business. ... A leap year (or intercalary year) is a year containing an extra day (or, in case of lunisolar calendars, an extra month) in order to keep the calendar year synchronised with the astronomical or seasonal year. ...


Sidereal solar calendars

If the position of the earth (see above) is reckoned with respect to the fixed stars, then the dates indicate the zodiacal constellation near which the sun can be found. Such a calendar is called a sidereal solar calendar. The astrological zodiacal constellations are the twelve constellations that constitute the astrological zodiac. ...


The mean calendar year of such a calendar approximates the sidereal year. The sidereal year is the time for the Sun to return to the same position in respect to the stars of the celestial sphere. ...


The Hindu Solar Calendar is a sidereal solar calendar. It is usually 365 days long, but now and then takes an extra day to make a leap year. A page from the Hindu calendar 1871-72. ... A leap year (or intercalary year) is a year containing an extra day (or, in case of lunisolar calendars, an extra month) in order to keep the calendar year synchronised with the astronomical or seasonal year. ...


Non-solar calendars

Calendars that are not solar calendars, include the Islamic calendar which is a pure lunar calendar and calendars synchronized to the synodic period of Venus or to the heliacal risings of stars. The Islamic calendar or Muslim calendar (Arabic: التقويم الهجري; at-taqwīm al-hijrī; Persian: گاه‌شماری هجري قمری ‎ Gāhshomāri-ye hejri-ye qamari; also called the Hijri calendar) is the calendar used to date events in many predominantly Muslim countries, and used by Muslims everywhere to determine the proper day on which to... It has been suggested that lunar year be merged into this article or section. ... The orbital period is the time it takes a planet (or another object) to make one full orbit. ... (*min temperature refers to cloud tops only) Atmospheric characteristics Atmospheric pressure 9. ... The heliacal rising of a star (or other body such as the moon or a planet) occurs when it first becomes visible above the eastern horizon at dawn, after a period where it was hidden below the horizon or when it was just above the horizon but hidden by the...


Lunisolar calendars are almost solar calendars, except that their dates additionally indicate the moon phase. A lunisolar calendar is a calendar whose date indicates both the moon phase and the time of the solar year. ... In astronomy, a phase of the Moon is any of the aspects or appearances presented by the Moon as seen from Earth, determined by the portion of the Moon that is visibly illuminated by the Sun. ...


See Also


  Results from FactBites:
 
Spartanburg SC | GoUpstate.com | Spartanburg Herald-Journal (310 words)
A solar calendar is a calendar whose dates indicate the position of the earth on its revolution around the sun (or equivalently the apparent position of the sun moving on the celestial sphere).
The Hindu calendar and Bengali calendar are a sidereal solar calendars.
Calendars that are not solar calendars, include the Islamic calendar which is a pure lunar calendar and calendars synchronized to the synodic period of Venus or to the heliacal risings of stars.
Kids.Net.Au - Encyclopedia > Solar calendar (127 words)
A solar calendar is a calendar whose date indicates the season for a given place on Earth.
In a solar calendar, the year begins at approximately the same place in the cycle of seasons.
The Islamic calendar is the most well known calendar that is not a solar calendar.
  More results at FactBites »

 
 

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