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 160
the other; And one, in regard to the other, iscalled the fupplemental triangle. 469. VIII. Two arcs or angles, when compared together, are faid tobe alike, or of the fame kind, when both are acute, or lefs than 900, oilwhen both are obtufe, or greater than 900 : But when one is greater andthe other… … (i39) SECTION V.SPHERICAL THEOREMS. L70. THEOREM I. In every fpheric triangle (abc), equal angles (b, c) are oppofite to equal$des (AC, ab) : And equal fides (ab, ac) are oppofite to equal angles ;c, b). _ |Oem. Since ab — ac, make ae = ad; and draw3D, ce. \ Thenis bd= ce; and Z_ aec=: Z_ adb.…
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)
