[Coffin, John Huntington Crane], 1815-1890. [from old catalog] · New York, D. Van Nostrand · leaf 76
diameter, as viewedfrom C ;J = M A B,its apparent semi-diameter, as viewedfrom A (B and B aretoo near each other tobe distinguished inthe diagram) ;iJ-CA, the earths radius.1st. For finding s, the right triangle C B M, gives sin s = yr (63) Were the body M in the horizon of A, or Z A M = 90°,its… … Fig. 19. or d: sin s = r- sin 7r,Jtc or nearly, since s and n are small, s==nn- (64) (65) ^ is constant for any particular body, as it is simply theratio of its linear diameter to that of the earth. (Hersch.Ast., p. 544.) For the moon (Hersch. Ast., p. 214), ■^ = 0.2729, n.\ (66) 70 NAVIGATION. s =…
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-314-207.webp)
