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    Re: Old Sextant on German money
    From: Alexandre Eremenko
    Date: 2007 Mar 11, 09:39 -0400

    > the person that is in the red spot
    > sees a bright flash of sunlight.
    Heliotrope was apparently designed to send a signal
    to the large distance when you see neither the red spot
    not the person. (The sizes of geodesic triangles are
    frequently more than 10 miles).
    How about signaling from a yacht to an airplane,
    for example?
    > or the direction where you want to send your signal is
    > not towards the sun
    And this too. It seems to me that this simple extra mirror
    (especially if it can be easily attached and detached from
    a sextant) would make a very good addition to a survival
    I've heard that simple heliotrops are also
    used in the long mountaneering expeditions, where
    the supplies a dropped from an airplane.
    This is a simplest way to indicate your location
    to an airplane on a sunny day. But they are probably
    pointed in some more sophisticated way than looking at
    a red spot on the target.
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