First Day of Winter - the Winter Solstice of 2008

First day of winter - the day is just a little bit longer tomorrow!
Explanation: If you took a picture of the Sun at the same time each day, would it remain in the same position? The answer is no, and the shape traced out by the Sun over the course of a year is called an analemma. The Sun's apparent shift is caused by the Earth's motion around the Sun when combined with the tilt of the Earth's rotation axis. The Sun will appear at its highest point of the analemma during summer and at its lowest during winter. Today, the Winter Solstice day in Earth's northern hemisphere, the Sun is at the bottom of the analemma.
http://apod.nasa.gov/apod/ap081221.html
From the always fun Nasa Astronomy Pic of the Day. Click the headline for another nice solstice pic, and here's a link to last years Voices solstice pic.
Courtesy of The Irish Times - the winter solstice sun shining into Newgrange. http://www.irishtimes.com/newspaper/frontpage/2008/1220/1229728408895.html



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