The American practical navigator : being an epitome of navigation and nautical astronomy (1888)
Bowditch, Nathaniel, 1773-1838, United States. Navy Dept. Bureau of Navigation, Cooper, Philip Henry, 1844-1912 · Washington : Govt. Print. Off. · leaf 131
at 20° and the barometei-at 3oi».67— The mean refraction by Table 20 is, 9 52 The correction for height of barometer is, + 13The correction for the temperature, -(- 42 True refraction, ID 47 There is sometimes an irregular refraction near the horizon, caused by the vapors near the surface of… … Art. 251. Dip of the horizon is the angle of depression of the visible sea horizon below the true horizon!arising from the elevation of the eye of the observer above the level of the sea. In Fig. 63 suppose A to be the position of an ob-server whose height above the level of the sea is AB. CAZ is…
Navigation · Nautical astronomy
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-359-250.webp)
