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
mhina-15 UTTMARKS GUIDE tion of these used in determining the position of apoint from some fixed plane or line adopted as aprimary. 43.—*What are Hour Circles? Hour Circles, declination circles, or celestialmeridians are great circles of P the celestial sphere passingthrough the poles. They… … Fig. 28. 44.- -*What is the Visible Horizon? The Visible Horizon is asmall circle limiting the ob-servers view at sea or theintersection of sea and sky. 0 is the point of observa-tion. H H H is the visible hor-izon of 0. (Fig. 29.)
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