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Subject: Re: September Equinox computation
From: Herbert Prinz (hprinz@XXX.XXX)
Date: Tue Sep 24 2002 - 18:58:10 EDT
Hi guys,
I was already wondering how Dan Allen could be off by more than 3 minutes
using Meeus' algorithm, but no way did I believe that the JPL ephemeris plus
Novas routines could be early by 3.5 minutes, whether its all written in
Fortran, C or Cobol.
So I plug the numbers into my carefully re-written Pascal version of the
Novas routines using DE200 and obtain (by doing what I described in my
earlier message) for the time of this year's autemnal equinox 4:55:24 UT1.
This value has the advantage that it agrees with what Meeus publishes in
"Tables of the Sun, Moon and Planets", as well as with what the USNO thinks
it should be. (see Earth's Seasons, etc. 1992-2005 ). This is probably not
a coincidence.
Herbert Prinz
>
> Jay Borseth wrote:
>
> The results I'm getting put the equinox at:
>
> 4:51:54 AM GMT on 23 Sep 2002, crossing at E 105 degrees 9' 56".
>
>
> Dan Allen wrote:
>
> PS - My computations for this year put the equinox at 4:52:04 AM GMT on
> 23 Sep 2002.
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