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    Sextant Terms
    From: Dan Allen
    Date: 2007 Oct 21, 11:51 -0600

    A sextant has an arc of 60 degrees; most (all?) sextants use the
    double reflecting principle to measure up to an angle of 120 degrees.
    
    A quintant has an arc of 72 degrees; these instruments can measure up
    to an angle of 144 degrees.
    
    It is my understanding that earlier instruments, which did not have
    the double reflecting principle, could only measure their arc's
    worth, so to speak.
    
    So a quadrant is 90 degrees; the instrument of the same name could
    only measure 90 degrees.
    
    An octant is only 45 degrees; these could only measure 45 degrees,
    but did not some octants use the double reflecting principle to
    measure 90 degrees?
    
    Dan
    
    
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