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 190
ab (when ab is lefs than 90*) de- :ribe another fmall circle m B (456), cutting the former in b : But when lie fide, as ab —= 1140 30, is greater than 90* j then about d, the op- iDfite pole to a, defcribe a fmall circle with the fupplement of ab, as ,:b, cutting the former fmall circle n b in b.… … ;tereAc=E= 83°i3/ci=f=i 56 40 AB=C=II4 30 ■ C—TZ=.D-z 26 33 O-f*0— H1 °3 j—d= 87 57 70°3i|/=|fum f358|=|difF. Ar.Co. fin. rSin f fumSin. \ diff. = 83° 13 0,00305 := 56 40 0,07806 3if 9»9744i5819,84158 = 70 = 43 Sum of the four Logs 19,8971 o I fum gives 6z° 39I 9,94855 Which doubled gives 12c °«q —…
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-65-41.webp)
