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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 17, 19:42 +0200
From: Marcel Tschudin
Date: 2008 Mar 17, 19:42 +0200
> This paper can be downloaded as pdf-file from here > http://adsabs.harvard.edu/abs/2000AJ....119.2472A Sorry, I realise only now that the paper can also be downloaded from the link which Andr�s provided. H o w e v e r , for all of you who are interested in setting up their own program for calculating refraction on self-defined atmospheric profiles and using the very efficient Auer-Standish-Procedure I recommend to obtain the following paper: C. Y. Hohenkerk and A.T. Sinclair, The Computation of Angular Atmospheric Refraction at Large Zenith Angles, NAO Technical Note No. 63, April 1985 I can imagine that Catherine Hohenkerk will be pleased to send you the paper as pdf-file if you ask her by mail: Catherine.Hohenkerk a t UKHO.gov.uk The paper contains more detailed explanations of the procedure than the original Auer-Standish paper. In addition it provides the source code (in fortran) for calculating refraction with a simple atmospheric model (troposphere and stratosphere) with the observer at sea level. It obviously still needs quite a bit of work to adapt this program to calculate multilayer atmospheres and also allowing for an observer being above sea level looking down to the horizon or to make it even capable of handling ducts. I recommend this paper; it is really a good starting point for such a project. Marcel --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
