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    Re: Bubble horizon
    From: Robert Eno
    Date: 2002 Dec 17, 10:22 +0000

    Correct. You do not need to worry about semi-diameter corrections because
    you are measuring the altitude of the center of the body. So when you
    extract the refraction corrections (for the sun and moon) from the
    Nautical Almanac you refer to the refraction tables for the starts rather
    than the sun/moon tables. Also, there is no dip correction required.
    
    Robert
    
    >Does this mean that since I would be placing the center of the observed
    body
    >on/in the bubble that there would be no semi-diameter correction only a
    >refraction correction say, for the sun?  Would seem that upper or lower
    limb
    >corrections are no longer required.
    >
    >Jim Dullea
    >Tech Marine Business, Inc
    >202 675-7782
    >dullea{at}tmbhq.com
    >
    >
    
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