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    Re: Lunar distance method of Chauvenet
    From: Roger W. Sinnott
    Date: 2020 May 26, 11:37 +0000
    Paul,

    Thanks for posting these worked examples from Chauvenet, which will help me debug my own lunar-distance program.  But I'm curious why you are setting delta-T (or, ET - UT) equal to +10 seconds.  According to the 2020 Astronomical Almanac, delta-T was +7.6s at 1855.0 and +7.7s at 1856.0.

    Roger

    -----Original Message-----
    >  1855-09-07 08:07 UT1 (correct time)
    >  +10 s delta T
    >  35.5° N 30° W (correct position)
    >  zero height of eye
    >  75 F (24 C), air pressure 29.1 inches Hg (985 mb)
    >
    >  
    >  1856-03-10 03:12:49 UT1 (correct time)
    >  +10 s delta T
    >  34°56.6' N 149°39.8' W
    >  zero height of eye
    
    

       
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