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 44
16 Fig. 30. DEFINITIONS 46.—*What is the Celestial Horizon? The Celestial Horizon is the great circle formedhy a plane passing throughthe center of the earth atright angles to the zenith ofthe observer and extendeduntil it intersects the celes-tial sphere. The plane ofthe Celestial Horizon is… … Fig. 31. 47.—What is the Artificial Horizon? Any liquid in a state of rest forming a reflectivesurface is an Artificial Horizon. Mercury beinggenerally used for this purpose. 48.—*What is the Dip of the Horizon? The dip of the sea horizon is the angle of de-pression at the point of ob-servation due…
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