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    Re: Station pointer London UK
    From: Alexandre Eremenko
    Date: 2012 Apr 4, 13:56 -0400

    Indeed!
    
    I am surprized. They do not say who makes them,
    Ken, is it by the Astra factory?
    The construction seems exactly the same as of the Soviet one
    that I have, except that the Soviet one is made entirely of bronze,
    and this one of an aluminium alloy.
    The box is of slightly different construction.
    (Soviet ones on e-bay usually cost a bit less).
    
    There are several imprecise points in the Celestaire description.
    
    a) You do not need to measure the DIRECTIONS (bearings) of 3 objects
    but only TWO HORIZONTAL ANGLES between them. This is done with
    a sextant. (A direction is measured with a compass, and it is
    hard, if not at all impossibe to measure with 1' accuracy).
    
    b) "There is only one solution". There are generally 2 solutions.
    The are usually far apart, if one takes the right objects to
    measure angles between them, and one of
    the solutions is usually on land.
    Geometrically, these solutions are the points of intersection
    of two circles (position lines). Two circles usually intersect at 2
    points.
    
    Alex.
    
    
    
    
    

       
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