A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Position-Finding
From: Gary LaPook
Date: 2018 Apr 13, 09:22 -0700
But what happens next year, after the stars have moved around? HO 249 volume 1 has a precession and nutation table for that but I don't think it will produce 0.1' accuracy although it is adequate for the 1' minute precision of the original HO 249.