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 43
Fig. 29. 45.—*What is the Sensible Horizon? The Sensible Horizon is aplane at right angles to theplumb-line at the point ofobservation in Fig. 30. H His the Sensible Horizon. … 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…
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