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    Re: Technique question
    From: Doug Royer
    Date: 2003 May 19, 17:05 -0700

    O.K.,let me explain better what I was asking earlier.I wasn't referring to
    takeing altitudes to the visible horizon.That is not the concern here.The
    concern is about the distance angle between the Moon and another
    body.Everyday at sea I check the Ie against the semi-diameter of the Sun.All
    other errors are checked periodically as the Tamaya's error has been
    consistantly 0.1'- 0.2' off the arc for eons under many differant
    conditions.Checking the Moon's semi-diameter accomplishes the same thing.I
    check for the true horizon as noted below during every observation.When
    takeing the distance measurements of the bodies I swung the arc.When Jupiter
    or the star touch the Moon's edge I took the reading.In the awkward position
    the sextant was in to get the readings maybe the objects were off center in
    the scope.I don't know if that would give a consistant error or not.5'of
    error is huge.I'll be on the alert for it from now on.My question about
    under what atmospheric conditions you guys observe Lunars remains
    unanswered.Is this a fair weather(clear skies) proceedure or have others
    accomplished it under adverse conditions,not that the conditions I had were
    all that adverse?
    -----Original Message-----
    From: Philip Ouvry [mailto:ranch.flamingo@INFONIE.FR]
    Sent: Monday, May 19, 2003 12:55
    Subject: Re: Technique question
    Many books warn of a possible false horizon under the moon.   However by
    panning left and right it is usually possible to determine the position of
    the true horizon.   With experience if you can see the edges of the moon
    then it should be feasible to take sights.
    Philip Ouvry

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