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. 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,… … w H— S is a heavenly body. The angle E Z S is the Amplitude of S. (Fig. 39.) 20 DEFINITIONS 57.—*What is Azimuth? Azimuth is the angle at zenith between themeridian of the observer andthe vertical circle passingthrough the center of thecelestial body. It is gener-ally reckoned from North inNorth…
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