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    Re: Fw: Re: How Worsley Navigated
    From: Frank Reed
    Date: 2009 Feb 28, 10:11 -0800

    George H, you wrote:
    "All that's needed is, for May 7th (and for May 6th and 8th also) Sun 
    declination and Equation of Time at Greenwich noon. Of course, such backwards 
    predictions are available from modern sources, but it would be nice to see 
    what the Almanac actually states."
    
    Any good modern source will differ only a few seconds of arc from printed 
    almanac data for that era. As luck would have it, I have an American Nautical 
    Almanac for 1916 within arm's reach. So here's the data for those dates from 
    that almanac as well as the same from my online Nautical Almanac.
    
    From the AmNA(1916):
    GMT(old)   Dec       EqT
    May 6 00h  16�31.4' 3m27.8s
    May 6 12   16 39.7   3 30.0
    May 7 00   16 48.1   3 32.2
    May 7 12   16 56.3   3 34.1
    May 8 00   17 04.5   3 36.0
    May 8 12   17 12.6   3 37.6
    
    From my online NA:
    GMT(new)   Dec      GHA Sun   EqT(GHA Sun/15)
    May 6 12h  16�31.4'  0�51.9'  3m27.6s
    May 7 00   16 39.8 180 52.5   3 30.0
    May 7 12   16 48.1   0 53.0   3 32.0
    May 8 00   16 56.4 180 53.5   3 34.0
    May 8 12   17 04.5   0 54.0   3 36.0
    May 9 00   17 12.7 180 54.4   3 37.6
    
    Enjoy.
    
    -FER
    PS: direct link to my online NA:
    http://www.historicalatlas.com/lunars/nadata_v5.html
    
    
    
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