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 47
Fig. 37. True Altitude is the angu-lar height of a point or thecenter of a celestial bodyabove the rational horizon,as measured from the centerof the earth. In Fig. 37. S 0 H is theTrue Altitude of S. 19 UTTMARKS GUIDE 55.—What is Zenith Distance? Zenith Distance is the arcof a vertical circle… … Fig. 38. 56.—*What is Amplitude? Amplitude is the angle at zenith between theprime vertical and the ver-tical circle passing throughthe center of the celestialbody at the horizon whilerising or setting. It is reck-oned from East while risingand from West while settingtoward North or South,…
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