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 272
ing cafes. H9 Quest. I. Four days ago we were in Lat.. 30 25 S.; and have fiwceat time run on a direcl courfe NW. by N. at the rate of 8 miles anmr: Required our prefent latitude and departure ? One day == 24 hours : Then 24 x 4 = 96 hours.And 96 x 8 = j68 miles, the whole diftance. Construction.r.… … ;Radbdift.! cof. Cou. Computation. — 900 oo 10,00000= 768 m. 2,88536= 33° W 99i98S idiff. lat. r= 638,6m. 2,80521Iw 6,0)63,9(10* 39. As RadTo dill.So fin. Cou. To dep. r± 900 00- iojooooO=: 768 m. 2,88536 - 33 45 9^74474 Anfwer Then Lat. fromdiff. lat. Lat. inDepart. —- 426,7 m. 2,63010is S. 10 39…
Navigation · Nautical astronomy · Fortification
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