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 124
CORRECTION OF OBSERVED ALTITUDES. 117 … FIG. 46. 301. The fact must be emphasized, however, that under certain conditions thedeflection of the rav in its path from the horizon to the eye is so irregular as to give avalue of the dip widely different from that which is tabulated for the mean state ofatmosphere. These irregularities usually…
Navigation · Nautical astronomy
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