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
on? Refraction is the bendingof a ray of light when passingthrough the atmosphere. Itrenders the observed altitudeto appear greater than its realvalue. The angles S 0 S is re-fraction. (Fig. 33.)Fig. 33. SO.—*What is Parallax? Parallax is the angle of theearths radius at the positionof the observer… … 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
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