Dawn

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For other uses, see Dawn (disambiguation).
Dawn in Peng Chau, Hong Kong.
Early morning in Xepon, Laos (July 2004).

Dawn refers to the twilight before sunrise. It is recognized by the presence of weak sunlight, while the sun itself is still below the horizon. There are also more technical definitions of dawn, including the following:

Astronomical dawn 
the moment after which the sky is no longer completely dark, formally defined as the time at which the sun is 18 degrees below the horizon in the morning. 1
Nautical dawn
the time at which there is just enough sunlight for the horizon and some objects to be distinguishable, formally defined as the time at which the sun is 12 degrees below the horizon in the morning. 1
Civil dawn 
that time at which there is enough light for objects to be distinguishable and that outdoor activities can commence, formally defined as the time at which the sun is 6 degrees below the horizon in the morning. 1

Dawn should not be confused with sunrise, which is the moment when the leading edge of the sun itself appears above the horizon.

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 minutes; in polar regions, dawn can last hours.

Folklore

In folklore, belief that dawn banishes evil spirits, zombies, ghosts, vampires, trolls, faeries and demons is common, for various reasons, throughout Eastern and Western cultures.citation needed


Dawn Timetable

A worldwide timetable for Dawn time calculation can be found at http://www.gaisma.com/en/

References

  1. ^ a b c National Oceanic and Atmospheric Administration. "Astronomical Terms".


See also

Sister project Wikimedia Commons has media related to: Dawn
v • d • e
Parts of a day
Dawn at Taritari (Nueva Esparta, Venezuela)
Night • Dawn • Sunrise • Morning • Noon • Afternoon • Twilight (Terminator) • Sunset • Dusk • Blue hour • Evening • Midnight
 Sunset at Knysna (Western Cape, South Africa)

Wikipedia content modification information:

  • This page was last modified on 22 November 2008, at 00:33.

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