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Altitude Correction When doing a sight reduction, this is the final correction to the sextant height needed to get the observed height. This term actually describes several different corrections (though we don't need to know this detail to use it): for the sun this correction is primarily the refraction and semi-diameter corrections; for the moon and planets it includes these and also a parallax correction; and for stars the altitude correction includes only refraction. See Refraction, Semi-diameter, Parallax, and Additional Altitude Correction.

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