| To: | <towertalk@contesting.com> |
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| Subject: | [TowerTalk] Equinox Day |
| From: | k1mk@alum.mit.edu (Michael Keane, K1MK) |
| Date: | Sun Mar 16 00:50:21 2003 |
At 02:03 PM 3/15/03, Jim Reid wrote: >Why today, and not on/nearer the 21st? Two reasons actually, >our latitude is only 21.9N and the Earth's orbit about >the Sun is elliptical, not circular. Actually, the center of the >Sun is still 2 degrees South of the Equator today. No. It's due to the non-zero angular diameter of the sun plus atmospheric refraction... See: <http://aa.usno.navy.mil/faq/docs/equinoxes.html> Michael Keane K1MK k1mk@alum.mit.edu |
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