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Altitude difference; in celestial navigation the difference between the corrected sextant altitude and the altitude at the position from which the sight has been worked. The observed (i.e. corrected) altitude is plotted on the chart towards or away from the body observed according to whether the calculated or the observed position is the greater.

See also marcq saint-hilaire method.

See also marcq saint-hilaire method.

Mike Richey

Subjects: Maritime History.

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