NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Antoine Couëtte
Date: 2011 Jan 28, 23:50 -0800
RE :
http://www.fer3.com/arc/m2.aspx?i=115506
[NavList] Re: Lat and Long by moon transit.
From: hhew36---com
Date: 28 Jan 2011 20:27
Dear Hewitt,
You wrote : "Looking at Kermit's results, I'd say he used the 6-30-2009 date."
I will reply as follow :
YES ! I used the 6-30-2009 (UT) date, with LT-UT = +9 , which was subsequently confirmed as correct by Jeremy.
And for the time of the Moon Transit (UT=09h51m39.7s), I am getting the following data for the Moon :
GHA = 229�56'3 with RA hourly change = +0�.5064 and
DEC = S-12�38'7 with DEC hourly change = -12'.86
The actual Moon declination on 6-30-2009 was (much) further to the South than what Jeremy first indicated : QUOTE The declination is about 7 degrees south UNQUOTE, which tells us that Jeremy's clue would actually have been more appropriate for 6-29-2009 as you say, but it was nevertheless quite "valid" for 6-30-2009 in the sense that the Moon was - for both dates - South of the 6-30-2009 Observer's Position.
Hewitt, since in your subsequent post (RE : http://www.fer3.com/arc/m2.aspx?i=115508) you indicated : QUOTE Thanks, Jeremy,, that clears it up nicely, -Hewitt UNQUOTE, which results are you getting for this Moon LAN ?
I would guess that all of us - yourself, Peter, Andres, Kermit, and others - should derive (almost) the same end result (see my enclosed listing of entries and results), even with a plain parabolic fit to Jeremy's data which certainly should be fully appropriate here given both the "moderate" Culmination height (@ 55�) and the "rather tight" time-span (@ +/- 12 minutes of time) around Culmination Time in this specific example.
Best Regards
Kermit
Antoine M. "Kermit" Cou�tte
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