The new American practical navigator : being an epitome of navigation, containing all the tables necessary ... (1802)
Bowditch, Nathaniel, 1773-1838, Lee, Marvin, former owner. DSI, Stuart, Gilbert, 1755-1828 DSI, Burndy Library, donor. DSI · [Salem] : Printed at Newburyport, Mass., 1802, by Edmund M. Blunt, for Cushing and Appleton, Salem : Sold by every book-seller, ship- chandler, and mathematical-instrument-maker in the United States and West Indies · leaf 41
, fince the angle ACB is 60° (being meafured bythe arch B A,) thefum of the angles CAB, CB A, muft be equal to 120°[by Art. 38,) and fince C A is equal to CB, (being both radii of the famecircle) therefore [by Art. 41,) the angle CAB is equal to CB A : Hence ei-ther of thefe angles is equal to the… … Geometry. a THE four following propofitions contain the demembration of the rulesby which all the calculations of trigonometry may be made: they were in-ferted here, in order to prevent any embarraffment to the young calculator,from the introduction of the demonftrations among the precepts…
Navigation · Nautical astronomy
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