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Encyclopedia > Dawn
Early morning in Xepon, Laos (July 2004).

Dawn is the period of time immediately preceding sunrise. It is recognized by the presence of weak sunlight, despite the fact that the sun itself is still below the horizon. There are a number of more technical definitions of dawn, including the following: Image File history File links Download high-resolution version (2048x1536, 991 KB) Dawn in Hong Kong File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Dawn ... Image File history File links Download high-resolution version (2048x1536, 991 KB) Dawn in Hong Kong File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Dawn ... Peng Chau (坪洲 in pinyin: Píngzhōu; in Jyutping: ping4 zau1; literal meaning: Flat Islet) is a small island located off the north-eastern coast of Lantau Island. ... Image File history File links No higher resolution available. ... Image File history File links No higher resolution available. ... The Rayleigh effect, seconds before sunrise in New Zealand Sunrise, also called sunup in some American English dialects, is the time at which the first part of the Sun appears above the horizon in the east. ...

Civil dawn is the time at which the sun is 6 degrees below the horizon in the morning. Civil dawn is defined as that time at which there is enough light for objects to be distinguishable and that outdoor activities can commence.[1]
Nautical dawn is the time at which the sun is 12 degrees below the horizon in the morning. Nautical dawn is defined as that time at which there is just enough sunlight for objects to be distinguishable.[1]
Astronomical dawn is the time at which the sun is 18 degrees below the horizon in the morning. Astronomical dawn is that point in time at which the sun starts lightening the sky. Prior to this time, the sky is completely dark. [1]

Dawn should not be confused with sunrise, which is the moment when the leading edge of the sun itself appears above the horizon. The Sun is the star at the center of the Solar System. ... A degree (in full, a degree of arc, arc degree, or arcdegree), usually symbolized °, is a measurement of plane angle, representing 1/360 of a full rotation. ... Horizon. ... The Rayleigh effect, seconds before sunrise in New Zealand Sunrise, also called sunup in some American English dialects, is the time at which the first part of the Sun appears above the horizon in the east. ...

Contents

Dawn changes with location

The length of time that dawn lasts varies greatly with the observer's latitude. In equatorial regions, dawn may last only a few seconds; in polar regions, dawn can literally last an hour or longer. A noontime scene from the Philippines on a day when the sun is almost directly overhead. ... Location of the polar regions Northern Hemisphere permafrost (permanently frozen ground) in purple. ...


Folklore

In Western folkloristic tradition it is believed that evil spirits, demons, vampires, trolls, and even Satan are obliged to disappear at dawn, for, being creatures of darkness, they hate light, especially that of the sun. Pre-Christian Celts also shared this belief. Folklore is the body of expressive culture, including tales, music, dance, legends, oral history, proverbs, jokes, popular beliefs, customs, material culture, and so forth within a particular population comprising the traditions (including oral traditions) of that culture, subculture, or group. ... In religion and ethics, evil refers to the morally or ethically objectionable behaviour or thought; behavior or thought which is hateful, cruel, excessively sexual, or violent, devoid of conscience. ... A ghostly woman coming down the stairs. ... St. ... Vampires are mythological or folkloric beings that subsist on human and/or animal lifeforce. ... Trolls with an abducted princess (John Bauer, 1915). ... For other uses, see Satan (disambiguation). ... Darkness is the absence of light. ... The Sun is the star at the center of the Solar System. ... This article is about the European people. ...


Traditionally dawn is the point at which a white thread can be distinguished from a black thread.[citation needed]


References

  1. ^ a b c Astronomical Terms page at National Oceanic and Atmospheric Administration (NOAA)

See also

Wikimedia Commons has media related to:
Dawn

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Dawn: A Journey to the Beginning of the Solar System (817 words)
Dawn's goal is to characterize the conditions and processes of the solar system's earliest epoch by investigating in detail two of the largest protoplanets remaining intact since their formations.
When Dawn was confirmed to go into development in February 2004 the Laser Altimeter and Magnetometer were not included.
Dawn title art background is from a painting by William K. Hartmann titled "A cocoon nebula, perhaps the primordial solar nebula."
Mission Overview (262 words)
Dawn will fly by Mars on its way to Vesta, and then ignite its ion engines again to go to Ceres.
The Delta II rocket carrying the Dawn spacecraft arcs through the morning sky toward space.
The Science team newsletter, Dawn's Early Light, has been established to keep members of the scientific community informed about the Dawn mission.
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