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Thursday, June 05, 2008


The number of daylight hours in a 365-day year is always 4,380 and it doesn't matter where you might call home. Arctic polar bears experience the same number of hours of daylight annually as African elephants and Antarctic penguins. Cloudiness aside, the sun shines for an equal amount of time on every square inch of the Earth's surface.

The complication is that, because the Earth's axis of rotation is tilted
23.45 degrees from the plane described by its revolution around the sun, the
daily hours of light, planet-wide, are distributed unequally through the
year. At the poles, daylight comes in six-month blocks; at the Equator it is
always within a few minutes of 12 hours a day. (WGN Weather Blog.)

Good to know.

Posted by Marie at June 5, 2008 7:16 PM


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