New plane and spherical trigonometry, surveying, and navigation (1903)
Wentworth, G. A. (George Albert), 1835-1906 · Boston : Ginn & Company · leaf 131
. Radius of parallel of latitude,2922.4 miles. 122 PLANE TRIGONOMETRY. 7. At what latitude is the cir-cumference of the parallel of lati-tude half of that of the equator ? The radius of the parallel will behalf of the radius of the earth. In the figure of Example 6, givenAC — i AO ; required 90° —… … Let 0 be the centre of the circle,AB a side of the polygon, and 0the middle point. Then in the 360°right triangle OCB, given O = = 13° 5046, 05 = 6.7; requiredAB = 2 CB. CB = OB sin BOC.log OB = 0.82607log sin 50(7 = 9.37897log C5 = 0.2050405=1.6034.^15 = 3.2068.Length of a side of the…
Trigonometry · Surveying · Navigation
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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-238-148.webp)
![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-390-270.webp)
