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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Modern Lunars
From: Paul Hirose
Date: 2016 Sep 27, 13:00 -0700
From: Paul Hirose
Date: 2016 Sep 27, 13:00 -0700
On 2016-09-27 1:33, Antoine Couëtte wrote: > I mentioned this sad fact to **Bureau des Longitudes** in writing 5 years ago (see enclosed document : " *110303 Quelle est la Précession utilisée par Serveur IMCCE .pdf* " ) , but I got no reply at all ... I regret my dear Friend *Pierre Bretagnon *who had just passed away because - had I mentioned this unwelcome fact to him - things woud have been straightened up by long now. I sent them an email on that a few years ago, with no response. The JPL HORIZONS calculator also uses the 1976/80 model, but it applies the pole offsets published by the IERS. These correct for the difference between the program's precession / nutation model and the actual pole. > I am suggesting the following steps: please indicate to me the actual Moon Apparent Equatorial Coordinates which you are computing and using for our now [*World*] famous Lunars #2, #3 and #4, i.e. for Sep 07th 1855 at 08:05:00.000 TT. Also please indicate exactly which deltaT value you are using. 07 SEP. 1855 , ΔT = + 7.68 s UT1 = 08h04m52.32s (TT=08h05m00.00s) 8.169499h +25.29193° geocentric apparent RA, dec. (DE406, IAU 2006 / 2000B precession / nutation)
