NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Nautical almanac 1773
From: Frank Reed CT
Date: 2007 May 1, 03:55 EDT
See what's free at AOL.com.
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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"
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
42.0N 87.7W, or 41.4N 72.1W.
www.HistoricalAtlas.com/lunars
See what's free at AOL.com.
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