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 46
Fig. 36. 54.—^What is True Altitude? … 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…
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