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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: An exotic lunar distance puzzle
From: Marcel Tschudin
Date: 2011 May 3, 23:51 +0300
From: Marcel Tschudin
Date: 2011 May 3, 23:51 +0300
Dave Fleming wrote
Refraction relates to index of atmosphere at the point the observation is made. At space shuttle orbit air is thin i.e. index = 1.
That is correct for the environment of the space shuttle. But the horizon at the surface of the earth is below the atmospheric layer and the refraction for this ray is the same as for an observer who sees the space shuttle at his horizon, i.e. at ZD 90 deg.
Marcel
Marcel
