Also using Time Zone Master
1) Clicking any clock and going to the equinox page, you then click on
the equinox (5:05 EDT for my case - Ottawa)
2) Then go to the sidereal page it shows 9:12:28 GST (sidereal time)
3) The time difference to noon is 2h 57m 31s
Multiply x 15 - you get 44d 22m 45s E
It shows a delta-T of 67 seconds
On 2011-09-22 23:59, James E. Morrison wrote:
My logic for answering the question of where on Earth will it be
apparent noon at the instant of the autumnal equinox is:
1. The Greenwich sidereal time at the time of the equinox (Julian day
2455827.87793) is 09:10:36.1
2. We want the longitude where the local sidereal time = 12:00:00 at
this instant.
3. The sidereal time difference is 02:49:24.
4. Times 15 for degrees = 42d 20m 59s E.
This corresponds to a meridian passing through Georgia, east Turkey
and bit west of Baghdad.
I used The Electric Astrolabe with a Delta-T of 66 sec to get the GST
value. Other programs may improve on the result.
Best regards,
Jim
James E. Morrison
janus.astrol...@verizon.net <mailto:janus.astrol...@verizon.net>
Astrolabe web site at http://astrolabes.org
From: axel törnvall gonzalez
Date: Sep 22, 2011 8:58:05 PM
Subject: Where it wil be equinox, at noon
To: <sundial@uni-koeln.de>
This is my Subject;
Finding the position, Longitud, where, the sprig equinox, will ocurr
at noon, I found some diference between the results of "The Dialist´s
Companion", and "Sun v.5.6 Of R.Cernic", both programs I work for some
time.
In Longitud 42°12,80" E at 13:03:42 PM it will be Noon, for my studies
Then I placed both programs in Latitud and longitud 0°, and in Sun
v5.6 of R.Cernic I got UT 09:03:59 AM and in The Dialist´s Companion,
I found the nearest cero declination at 08:44:47AM the altitude
measure have a difference of almost 5°, I Know The Dialist Companion I
Use vers 1.1.b is old.
Sorry my english, it´s not my first language
Best regards for all of you
Axel
32°39'59"S
70°42'41"W
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