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From: Marcel E. Tschudin (no email)
Date: Thu Aug 04 2005 - 06:48:25 EDT
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 Bennett's 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
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