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    Re: Jack Aubrey's fixing of longitude
    From: Michael Dorl
    Date: 2011 Jun 19, 11:01 -0500

    > Yes perhaps, but from the description of, "the moon, with Venus clear
    > above her," it sounds as though Venus was conjunct the moon - or very
    > nearly so. So what does the measurement, "Two seven four," signify?
    > It might have been an occultation of Venus. As the Surprise was at a
    > latitude of about 15 degrees South at the time, the moon may well
    > appear to be travelling vertically up to an occultation with Venus.
    > But again, what does the measurement, "Two seven four," signify?
    What year are we talking about?
    There was a venus occultation 12 april 1785.
    1805 would be a better year; Lewis & Clark tried to establish longitude
    from a lunar eclipse that year Jan 14/15.

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