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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Talking to "Official" Authorities
From: Paul Hirose
Date: 2012 Apr 10, 11:35 -0700
From: Paul Hirose
Date: 2012 Apr 10, 11:35 -0700
Antoine Couëtte wrote: > - By the same time, I sent to Bureau des Longitudes / IMCEE a note about the (strong) possibility of inconsistent Precession use for data published on their server for remote times. What is the problem, Kermit? Some precession models are optimized for the present time, plus or minus a few centuries, and should be used with caution at remote epochs. For example, before 500 AD the IAU 1976 model is more accurate than the IAU 2000 model. Both are less accurate than the 2006 model. (I compared all three models to a new long term model published [A&A 534, A22 (2011)] last year.) --
