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 40
p;c. of any arch in one circle,is to the chord, fine5 tangent,&c. of the fame arch in a-nother, as the radius of theone is to the radius of theother. Let ABD, abd,be two circles ; BD, bd,two arches of thefe circles,equal to one another, orconfifting of the fame num-ber of degrees ; F D, f d,the… … b e, Sec. For fince the arches B D, b d, are equal, the angles B C D, b c d,are alfo equal, and FD, fd, being tangents to the points D and d, the an-gles CDF, cdf are each equal to a right angle (by art. 22) ; therefore,imce in the two triangles C D F, c d f, the two angles F C D, C D F of the »…
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-343-234.webp)