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    Re: Moon HP and Earth SD
    From: Lars Bergman
    Date: 2018 May 13, 11:36 -0700

    Frank, you wrote: "Thinking about the view from the Moon would have been considered far too hypothetical and literally outlandish even fifty years ago".

    Wrangel, in 1910 (2nd edition), in "Lärobok i teoretisk och praktisk navigation" wrote "parallax är den vinkel, varunder jordradien synes från en himmelskropp" or, in my translation, "parallax is the angle of the earth's radius as seen from a heavenly body".

    That was written some 110 years ago. Wrangel was the standard work in Sweden during the first quarter or half of the 20th century.


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