NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Antoine Couëtte
Date: 2023 Oct 10, 14:52 -0700
Extra checks from previous submission :
From N28°00.0' - W090°00.0' on Oct 14, 2023 (TT-UT = +69.7s)
(1) - Check between Lunar Software and Heights Simulation Software
All values refracted, and augmented as regards SD's
15h36m07.3s UT : ABS (Sun Center - Moon Center) Heights : 30.43140' and ABS (Sun Center - Moon Center) Azimuths * cos average height = 7.02818'
Square root of the above : 31.23244' Sun SD=16.02400' , Moon SD=15.19500' Sun SD + Moon=31.21900' Difference: 31.23244'-31.21900 ' = 0.01'
18h51m13.1 UT : ABS (Sun Center - Moon Center) Heights : 16.73580' and ABS (Sun Center - Moon Center) Azimuths * cos average height = 26.43003'
Square root of the above : 31.28312' Sun SD=16.02750' , Moon SD=15.23550' Sun SD + Moon=31.26300 ' Difference: 31.28312'-31.26300' = 0.02'
Hence the Lunar Software and the Simulation Software - totally different Software - give results fully consistent with one another.
(2) - Check with Frank E. Reed's On Line Lunar Computer
From N28°00.0' - W090°00.0' at 15h36m07.3s UT with Lunar distance = 0°00.0' : Error in Lunar 0.08'
From N28°00.0' - W090°00.0' at 18h51m13.1s UT with Lunar Distance =0°00.0' : Error in Lunar 0.18'
This independent check indicates that the UT times determined through (1) are realistic and are not far from actual values (certainly within 6" and probably within 4" as most often observed).
Kermit
