NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Refraction at the horizon.
From: Marcel Tschudin
Date: 2008 Mar 20, 13:05 +0200
From: Marcel Tschudin
Date: 2008 Mar 20, 13:05 +0200
> Nevertheless, there remains much explaining to do, about the very different > senstivity Marcel's model shows, to pressure changes and to temperature > changes. The reason for this difference is very likely the following: In the atmospheric model the layer heights (volume) and the temperature differences across a layer are constant (according to the given lapse rate profile). Changing the temperature (only) at the observer changes in all layers the relative temperature difference (= change of temperature in percent of the mean temperature) AND the pressure differences in each layer according the hydrostatic equations. When changing the pressure (only) at the observer the relative temperature differences of the layers remain unchanged. Only the pressure differences have now to be adjusted in all the layers to the different condition at the observer. Marcel --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
