Uttmark's guide to the United States local inspectors examination for masters and mates of ocean going steam and sailing ships (1919)
Uttmark, Fritz E · [New York] The Author · leaf 45
UPPER LIMB -^- LOWER LIMB 51.—*What is Semi-Diameter? Semi-diameter or half di-ameter is the angular meas-urement of the radius of acelestial object as seen fromthe observers position. The angles SOL and S OL are the Semi-diameters ofFig. 35. S. (Fig. 35.) 18 … DEFINITIONS 52.—What is Augmentation of the Moons Semidiameter? The Augmentation of the Moons Semidiameteris the apparent increase due to the decrease in dis-tance from the observer as the moon rises above thehorizon. 53.—What is Observed Altitude? The Observed Altitude isthe angular height above…
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