American practical navigator: an epitome of navigation and nautical astronomy (1914)
Bowditch, Nathaniel, 1773-1838, Logan, George Wood, 1868-1915, United States. Navy Dept. Bureau of Equipment · Washington, Govt. Print. Off · leaf 123
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 true FIG. 43. horizon and the apparent direction of the sea horizon. Values of the dip… … CORRECTION OF OBSERVED ALTITUDES. 117
Navigation · Nautical astronomy
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