NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Peter Hakel
Date: 2011 Feb 5, 12:11 -0800
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Nautical Almanac: 2011 Commercial Edition (UK Hydrographic Office)
iNA (iPhone app by StarPilot)
Celestial (iPhone app by Navimatics Corporation)
UT=01:00:00
S 9d 12.7'
UT=17:00:00
S 6d 05.2'
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moon.xls: (based on Chapront ELP-2000/82 lunar theory)
(DeltaT=67.2s, from http://eclipse.gsfc.nasa.gov/SEhelp/deltatpoly2004.html)
UT=01:00:00
S 9d 12.7'
UT=17:00:00
S 6d 05.3'
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Peter Hakel
From: Antoine Couette <antoine.m.couette@club-internet.fr>
To: NavList@fer3.com
Sent: Sat, February 5, 2011 9:12:33 AM
Subject: [NavList] Re: 2011 Nautical Almanac
RE :
http://www.fer3.com/arc/m2.aspx?i=115555
[NavList] Re: 2011 Nautical Almanac
From: waldendand---com
Date: 4 Feb 2011 09:40
Somewhat surprisingly, if I'm doing things right, Gary's Air Almanac data for the declination of the Moon for 4 Feb 2011 seems to disagree with a consensus of a number of other sources including, Moshier, JPL horizions, ICE, USNO online, and others. Anyone else?
*********
Hello Dave,
Yes, that is strange indeed !
With TT-UT=+67.2 s, on Feb 04, 2011, for the Moon I find the following :
01:00:00 UT, MOON DEC = S -9°12'43"9 (+/- 6") , and
17:00:00 UT, MOON DEC = S -6°05'14"7 (+/- 6") while for this same moments, the Air Almanac publishes :
01:00:00 UT Moon Dec = S -9°12'
17:00:00 UT Moon Dec = S -6°04'
Certainly there is an error in the published coordinates by the Air Almanac, an event which is likely to be an extremely rare occurrence ..
Best Regards
Kermit
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