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    Re: Nautical almanac 1773
    From: Frank Reed CT
    Date: 2007 May 1, 03:55 EDT
    DW, you wrote of the lunar distances:
    "Using xephem, a fast, easy to use linux program, with open source:"
    And:
    "1200 GMT geocentric 48-14-59"
    And:
    "1200 GAT geocentric 48-18-20"
     
    Those values differ 3 to 4 arcseconds from the ones I quoted previously. Which are right? Is the difference real?? I do believe that we can quote lunar distances to 1 arcsecond accuracy, based on modern ephemerides, even for dates back in 1773. Of course, such small differences are below the level of significance for navigational observations.
     
    -FER
    42.0N 87.7W, or 41.4N 72.1W.
    www.HistoricalAtlas.com/lunars




    See what's free at AOL.com.

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