NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Moon's 4SD
From: Bill B
Date: 2006 Nov 02, 17:13 -0500
From: Bill B
Date: 2006 Nov 02, 17:13 -0500
Alex wrote > The real value depends on the Moon's altitude and it > is given by approximate formula > > SD=0.27277HP(1+sin(HP)sin(ALT)), > > where HP is the Moon Horizontal Equatorial Parallax > (rightmost column of the Moon section of the daily page) > and ALT is the Moon altitude. > The second term is non-negligible if we talk about 0.1' > precision! For ALT are you using Hc? At what time and place is the moon SD published in the almanac determined? 12:00:00 at Greenwich? Meridian passage at Greenwich? Bill --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To , send email to NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
