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» Online Classroom   »   » Public Discussion of Cel Nav   » Aries in perpetual almanach

   
Author Topic: Aries in perpetual almanach
Friedrich


 - posted May 17, 2017 03:20 PM      Profile for Friedrich           Edit/Delete Post 
Where can I find GHA for Aries in perpetual almanach?
David Burch


 - posted May 17, 2017 03:39 PM      Profile for David Burch           Edit/Delete Post 
I do not think this is listed directly in the LTA ( http://www.starpath.com/catalog/books/1882.htm ).

However, since Alpheratz is at SHA = 358, you can just look up the GHA of Alpheratz and add 2º. that will likely always be within 1º or so.

When using the LTA, we only need GHA Aries for star sight planning or star ID, so that would be accurate enough.

note in normal sight reduction we need GHA Aries, as precise as possible, but that is not the case in the LTA. It does the nav stars directly to GHA and dec.

you can test this for any lat-lon, date and time with http://www.starpath.com/usno.

From: Starpath, Seattle, WA


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