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    Re: Moon’s SD
    From: Murray Peake
    Date: 2020 Jan 7, 18:09 +0100
    Hi,
    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.

    Murray

    On Tue, Jan 7, 2020 at 6:04 PM Jim Rives <NoReply_JimRives@fer3.com> wrote:

    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.  

    Thanks. 

    Jim Rives

    43N 71W

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