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February 14, 2003
Q. When it is noon in New York City, Winnipeg, Amsterdam or Greenwich, what time is it at the North Pole?
A. It can be any time you want! The concept of time zones, which are based on longitude, falls apart at the poles, where all longitudinal lines intersect, says New Mexico Institute of Mining and Technology geophysicist Rick Aster. Here the sun simply spirals around the sky, moving from 23.5 degrees below the horizon at the winter solstice to 23.5 degrees above in mid-summer.
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