NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Q: how to calculate refraction at higher altitudes onland?
From: Victor Reijs
Date: 2002 Feb 28, 16:32 +0000
From: Victor Reijs
Date: 2002 Feb 28, 16:32 +0000
Hello Dan, Beside the refraction (and I have the idea that your deductions are correct), you still have the horizon dip, which is dependent on the altitude. So keep that in mind. See also my web pages to calculate these things: http://www.iol.ie/~geniet/eng/refract.htm All the best, Victor Dan Allen wrote: > My guess is that if refraction is stricly due to atmospheric thickness, the barometric pressure is sufficient, but if there are > geometrical aspects to refraction (which I know there are since there is no refraction for a body directly overhead), then elevation > much above sea level needs to be accounted for separately from barometric pressure. The question then is, by how much? -- URLs: http://www.iol.ie/~geniet http://www.iol.ie/~geniet/eng/archaeocosmology.htm http://www.iol.ie/~geniet/maeshowe http://www.iol.ie/~geniet/setrise http://www.iol.ie/~geniet/irishstones http://www.iol.ie/~geniet/stpatrick