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View other events for the week of 12/21/2004
Winter Solstice
Date Tuesday December 21
Time 4:30 AM - 4:30 AM
Location Details
The "top" half of the Earth.
Event Type Other
Organizer/Authorgaia
Solstice Time

Tues., Dec. 21, 2004, marks the solstice—the beginning of winter in the Northern Hemisphere and summer in the Southern Hemisphere.


In astronomy, the solstice is either of the two times a year when the Sun is at its greatest distance from the celestial equator, the great circle on the celestial sphere that is on the same plane as the earth's equator. In the Northern Hemisphere, the winter solstice occurs either December 21 or 22, when the sun shines directly over the tropic of Capricorn; the summer solstice occurs either June 21 or 22, when the sun shines directly over the tropic of Cancer. In the Southern Hemisphere, the winter and summer solstices are reversed.


Reason for the Seasons


The reason for the different seasons at opposite times of the year in the two hemispheres is that while the earth rotates about the sun, it also spins on its axis, which is tilted some 23.5 degrees towards the plane of its rotation. Because of this tilt, the Northern Hemisphere receives less direct sunlight (creating winter) while the Southern Hemisphere receives more direct sunlight (creating summer). As the Earth continues its orbit the hemisphere that is angled closest to the sun changes and the seasons are reversed.


Longest Night of the Year


The winter solstice marks the shortest day and the longest night of the year. The sun appears at its lowest point in the sky, and its noontime elevation appears to be the same for several days before and after the solstice. Hence the origin of the word solstice, which comes from Latin solstitium, from sol, "sun" and -stitium, "a stoppage." Following the winter solstice, the days begin to grow longer and the nights shorter.


The precise moment of the 2004 solstice will be December 21, 2004 at 4:42 A.M. PST (12:42 UT).

Added to the calendar on Friday Sep 3rd, 2004 12:32 AM
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