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    Re: 2011 Nautical Almanac
    From: Peter Hakel
    Date: 2011 Feb 5, 12:11 -0800
    Moon declination for 4 February 2011:

    Nautical Almanac: 2011 Commercial Edition (UK Hydrographic Office)
    iNA (iPhone app by StarPilot)
    Celestial (iPhone app by Navimatics Corporation)

    S 9d 12.7'

    S 6d 05.2'

    moon.xls: (based on Chapront ELP-2000/82 lunar theory)
    (DeltaT=67.2s, from http://eclipse.gsfc.nasa.gov/SEhelp/deltatpoly2004.html)

    S 9d 12.7'

    S 6d 05.3'

    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 :
    [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


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