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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Refraction
From: Marcel Tschudin
Date: 2005 Aug 4, 13:48 +0300
From: Marcel Tschudin
Date: 2005 Aug 4, 13:48 +0300
Hello
While searching with Google, I came across this
mail list. May be some one out here may be able to help me answering the
following question:
How do refraction values for negative
elevations have to be calculated, such as e.g. the horizon from a plane? (I am
interested in the range of 0° to approx. 5°.)
Is Bennetts approximation also valid for
negative elevations? If not, what other approximation formulae should be used,
or, where can one find some benchmark values?
I am interested in formulae for both,
refraction from apparent position and from physical
position.
Thank you for any input to my
problem.
Marcel