NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Star-star distances for arc error
From: Frank Reed
Date: 2009 Jun 19, 23:07 -0700
From: Frank Reed
Date: 2009 Jun 19, 23:07 -0700
Peter, you wrote: "Yes, that's the one. My edition says: R = 0.0167 / tan( H + 7.32/(H+4.32))" Yeah, that would explain it then. That formula is an empirical fit to the refraction table. It's close enough for most navigational calculations. That particular formula (an earlier variant of it) was originally published in the 1980s, I think, by George Bennett. Back then when computing devices had very limited memory and slow processors, this was a great thing: a nice compact equation for refraction at any altitude. But these days?? -FER --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
