NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Lunar Distances with Alex's SNO-T
From: Fred Hebard
Date: 2006 Oct 31, 08:52 -0500
From: Fred Hebard
Date: 2006 Oct 31, 08:52 -0500
Alex, Use the actual pressure. That is the determinant for the refraction correction. The elevation above sea level has an insignificant effect on parallax, when you consider that the radius of the earth is about 3400 nautical miles, but significantly reduces refraction via the effect on barometric pressure. Fred On Oct 31, 2006, at 8:27 AM, Alexandre E Eremenko wrote: > Related question: the barometric pressure in the refraction formula. > Should I use the actual pressure at my observation site, > or should I "reduce it to the sea level"? > The actual pressure at my site reflects not only the deviation > from the standard atmosphere but also my altitude over the sea level. > > Alex > --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To , send email to NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
