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Augmentation of Moon''s Horizontal Semi-diameter

The significance of the Augmentation of Moon''s Horizontal Semi-diameter is:
The definition of Augmentation of Moon''s Horizontal Semi-diameter is:

Increase of Moon''s semidiameter as she rises above horizon, this increase being up to 18" of arc greater in zenith than in horizon. Semi-diameter tabulated in Nautical Almanac is based on observer being at centre of Earth and, therefore, at centre of all rational horizons.


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