The elements of navigation : containing the theory and practice, with all the necessary tables, to which is added, a treatise of marine fortification ... (1754)
Robertson, J. (John), 1712-1776, Adams, Charles Francis, 1807-1886, former owner. BRL, Adams, John, 1735-1826, former owner. BRL, Boston Public Library) John Adams Library BRL · London : Printed for J. Nourse ... · leaf 79
he In- Cvjard and oppoftte a?rgle (d) ; and the alternate angles(V5 d) are equal: and the contrary. . TV B /,/ B Dem. Becaufe cd and ab are parallel by fuppofition:Then fe has the fame inclination to cd and ab. (144) And this inclination is expreffed by the £_ a or Z. d: (i°5) Therefore the outward… … GEOMETRY. 186. THEOREM IV. In any right lined triangle (abc), the fum of thethree angles (a, b, c,) are equal to two right angles :And if one fide (bc) be continued, the outward angle(f) is equal to the fum of the two inward and oppofttgangles (a, b). B C T> Dem. Thro a, draw a right line…
Navigation · Nautical astronomy · Fortification
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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-65-42.webp)
