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    Re: Determing the bearing off a celestial object.
    From: Greg Rudzinski
    Date: 2015 Mar 30, 08:33 -0700


    I just did a trial with an improvised quad microscope slide for the purpose of taking high altitude Sun azimuth.  The 4 slides show multiple linear Sun images which are to be rocked perpendicular to the horizon before taking the bearing using a hand compass placed in front of the 4 slides. The reflected Suns show well over the hand compass bearing readout. Once the hand compass is checked for deviation then it becomes the standard to check the steering compass or for taking bearings while piloting. Stand well above and behind the steering compass when doing this. 2° precision is obtainable which should be good enough for checking a small craft steering compass with 5° graduations.

    Greg Rudzinski


    From: Herman Dekker
    Date: 2015 Mar 28, 06:14 -0700

    In some books you read determ the bearing off a celestial object.

    How can you do that reliable?
    Is there a special compass or so for this purpose?
    With a normal magnetic bearing compass you can look only a few degrees upwards
    before the compassrose stalls.

    A compass with pelorus may works perhaps, but who has that, with a free sight
    around a yacht?

    So who has the solution for this?





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