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Subject: Re: Bubble horizon
From: Robert Eno (enoid@XXX.XXX)
Date: Tue Dec 17 2002 - 05:22:00 EST
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@XXX.XXX
>
>
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