NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Formula for refraction
From: Alexandre Eremenko
Date: 2007 Mar 20, 15:53 -0700
From: Alexandre Eremenko
Date: 2007 Mar 20, 15:53 -0700
What is the exact formula for refraction (for stars) used in the Almanac? The formula given in Meeus does not match the almanac table sometimes by more than 0'1. Meeus's formula is certainly approximate (and he says so) but it does not match the almanac table with the precision Meeus claims. Chuvenet has complete theory but no useful simple formula. My question is practical: I want to incorporate automatic refraction computation in my spreadsheet for star distances. Alex. --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To unsubscribe, send email to NavList-unsubscribe@fer3.com -~----------~----~----~----~------~----~------~--~---
