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    Re: Coordinates from IMCCE and JPL HORIZONS
    From: Dave Walden
    Date: 2016 Mar 14, 19:05 -0700

    USNO NOVAS GCRS values:

    +  19 hr 13 min 18.3979 sec  -  20 deg 39' 54.624"

    ****************************

    From: Paul Hirose
    Date: 2016 Mar 14, 15:17 -0700

    ...

    I have no procedure for USNO coordinates, since I have not coded their
    precession - nutation model. (It has been published, however.)
    
    Here are Dave's coordinates after conversion to the GCRS. For comparison
    I include my own coordinates.
    
    19h13m18.3980s -20°39'54.627 HORIZONS
    19h13m18.3980s -20°39'54.625 IMCCE
    19h13m18.3979s -20°39'54.626 me
    
       
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