A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Moon’s SD
From: Murray Peake
Date: 2020 Jan 7, 18:09 +0100
That number is the ratio of the Earth's radius to the Moon's radius. The HP of the moon is the semi-diameter of the earth seen from the moon, Draw it out, and it gets clearer.
My 2c worth.
I have read that in arriving at the Moom’s semidameter you multiply the horizontal parallax, HP, by a factor of .2724. How does this get you the SD?
Be kind... I was an accountant so my math sort of peters out around pre-calculus.
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