Re: Longest day of year?
- From: David Bernier <david250@xxxxxxxxxxxx>
- Date: Wed, 22 Jun 2005 00:17:26 -0400
Charlie wrote:
Peter Webb wrote:
The longest peiod of daylight occurs in the Northern hemisphere on June 21st.
Are you sure? (No matter How close to equator)
The sun moves Eastward with respect to the stars. If it moved with constant angular
(right ascension coordinate) velocity , then days at the equator would have equal length. However, the angular velocity varies.
Intuitively, the day at the equator should be longest when
the sun's angular velocity is greatest (i.e., when
the sun is moving Eastward fastest with respect to
the stars).
For 2005, this happens around December 23.
I've tried to confirm this with some online calculators of sunrise and sunset. However, even in Singapore (at 1 or 2 degrees North), the longest day is on or around June 21... And in Quito, Ecuador, (0.2 degrees South), the longest day is in December.
David Bernier .
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- From: Charlie
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