NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Refraction at the horizon.
From: George Huxtable
Date: 2008 Mar 15, 19:52 -0000
From: George Huxtable
Date: 2008 Mar 15, 19:52 -0000
Bill Noyce wrote- | I think the refraction between the observer and his horizon *does* | make a bit of difference in how sunsets are timed. Specifically, it | affects how distant that horizon actually is, and therefore affects | the direction of the light-ray that just grazes the ocean surface. | How big is this effect? It's zero. By definition, a light-ray that just grazes the ocean surface has only one possible direction; tangential to that surface, and therefore horizontal at that point. George. contact George Huxtable at george@huxtable.u-net.com or at +44 1865 820222 (from UK, 01865 820222) or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK. --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
