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    Re: Digital Camera Celestial Navigation
    From: Marcel Tschudin
    Date: 2008 Jul 5, 01:20 +0300

    Frank asked:
    "How reliably can one measure the flattening using a digital camera? A
    few tenths of a minute of arc??"
    
    Just to give you an idea (using 6x optical zoom and magnifying the photo 4x):
    with the sun's upper limb about 2.5 degrees above the apparent horizon
    Sun diameter horizontal: 125mm +/-about 0.5-1mm,
    Sun diameter vertical: 120mm +/-about 0.5-1mm
    The value for the sun's (horizontal) diameter at that time is 0.525�
    
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