Monthly Archives: September 2015

Altitude Correction for Dip

Dip.  A correction has to be made to the sextant altitude to allow for the height of the observer’s eye above the horizon; this is known as Dip. Consider the diagram below: O is an observer’s position on the Earth’s … Continue reading

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Altitude Correction for Semi-Diameter

An adjustment for semi-diameter is one of the corrections that may have to be made to the sextant altitude in order to calculate the True Altitude.  Corrections For The Moon’s Semi-Diameter.  The point on the Moon’s circumference nearest to the … Continue reading

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