Nautical words



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Atwood's Formula. For finding righting lever of ship-shaped bodies when heeled.

Vol. of wedge displacement x h1h2

GZ= --------------------------------------------- — BG Sin 

Vol. of displacement



Augmentation. Name applied to the optical illusion that makes Sun, Moon, planets and constellations appear to be larger when near horizon than they appear to be when at greater altitudes.

Augmentation of Moon's Horizontal Semi-diameter. Increase of Moon's semi-diameter 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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