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: Bill B
Date: 2006 Oct 31, 16:50 -0400
From: Bill B
Date: 2006 Oct 31, 16:50 -0400
Alex I located the Frank's post. "RE: Refraction for beginners" 7/9/04 Frank wrote: "It's interesting (well, as interesting as this sort of stuff can get) that the percentage change (as opposed to the additive change) is nearly the same at all altitudes. If you climb 1600 feet into the atmosphere from sea level the pressure drops just about 5%. If you write this new pressure down and climb another 1600 feet, the pressure drops by just about 5% from that new pressure you wrote down. Even at 50,000 feet, if you climb 1600 feet, you will find that the pressure at 51,600 is lower by nearly 5% from the pressure you left behind at 50,000. This happens because, from a mathematical point of view, the density of the atmosphere drops exponentially with altitude roughly according to the formula (density at height h) = (density at sea level) * exp( - height / 32000feet)." Bill --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To , send email to NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
