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    Re: Modern Lunars
    From: Paul Hirose
    Date: 2016 Sep 26, 20:34 -0700

    On 2016-09-25 22:08, Antoine Couëtte wrote:
    > Also are my Apparent Equatorial Coordinates from the Bureau des Longitudes 
    Server the same as the ones you are obtaining on your side ? Maybe this 
    should be the very first point to check again together this time. I am using 
    the following ones (*before* performing the +0.50"/-0.25" correction earlier 
    mentioned):
    > *Moon, 1855-09-07T08:05:00.00, i.e. 08h05m00.000 s TT : RA = 08 h 10 m 
    10.16146 s , DEC = +25 *°* 17 ' 31.0209 ", Distance = 0.002701090 UA,*
    
    There are some discrepancies:
    
    08 10 10.16146 +25 17 31.0209  Bureau des Longitudes
    08 10 10.1690  +25 17 31.006   JPL HORIZONS
    08 10 10.196   +25 17 30.96    me DE406
    08 10 10.195   +25 17 30.97    me DE422
    
    Does Bureau des Longitudes still use the IAU 1976/80 precession nutation
    model? JPL does, but corrected with the pole offsets from the IERS in
    recent epochs. I don't know what corrections they apply in the 19th
    century. I use the IAU 2006/00A precession nutation model.
    
    I also have the 1976/80 model. However, my results are almost 2 arc
    seconds from JPL, so I'm doing something wrong.
    
    

       
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