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Subject: Re: September Equinox computation
From: Robert Eno (enoid@XXX.XXX)
Date: Tue Sep 24 2002 - 08:29:00 EDT
There are several methods that can be used. Most recently, I used my
nautical almanac and was able to pin it down to the nearest minute. I
don't know if that is precise enough for your purposes.
Essentially you go to the nearest hour to when the sun's declination is
close to zero, note the "v" increment (in this case it is 1.0) then go to
the back of the almanac and scroll through tables until the correction for
the "V" increment takes the declination down to precisely zero. If my
memory serves me right, I believe equinox occurred on 23 September at
04:52 GMT.
I may have fumbled the explanation somewhat because I do not have my
nautical almanac in front of me.
Rest assured that you will get lots of answers from this forum!
>Which method would you use to PRECISELY compute (hh-mm-ss) the September
>equinox?
>
>Pierre Boucher
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