American practical navigator: an epitome of navigation and nautical astronomy (1914)
Bowditch, Nathaniel, 1773-1838, United States. Navy Dept. Bureau of Equipment, Logan, George Wood, 1868-1915 · Washington, Govt. Print. Off. · leaf 123
is, the line AH would generate theplane of the true horizon, while the pointT would generate a small circle or theterrestrial sphere called the Visible or SeaHorizon. The Dip of the Horizon isHAH, being the angle between the truehorizon and the apparent direction of thesea horizon. Values of the… … Fig. 4j CORRECTION OF OBSERVED ALTITUDES. 117
Navigation · Nautical astronomy
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
