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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Floating-Point 4-place Nat-Haversine Table
From: Greg Rudzinski
Date: 2018 Dec 10, 15:04 -0800
From: Greg Rudzinski
Date: 2018 Dec 10, 15:04 -0800
Tony,
No more than 5 places are needed. I will remind that the final look-up is a zenith distance so to be using the 0° to 3° range would translate into observations of 90° to 87° which are on the very high side for practical use and could be plotted directly on a plotting sheet without sight reduction if needed. When the latitude and declination sums are near or at 0° the hav-Doniol formula compenasates for the lack of precision of the tables. Keep it simple.
Greg Rudzinski
