n fide :\ So the cofine of the fir ft fegment,To the cofine of the fecond fegment. If the perpendicular fall within the triangle, the fum;ft without, the difference is the angle inquired. Illuftratiou ^Arithmetical. As the Radius DS <?oTo the tangent of S O 36.1212 So the cofine of C D, viz.. D… … To the cofine of IF, viz.. IQTherefore the arch IFAnd the firft arch found LISum of the vertical angles 43.6980 46.^020 57-6973103.9993 Z 2 to.oooopooo 9.863351360.9375 3063 9.80088199the Jfegment DC B, 9.64991151 9.761439379.7278602$ 19.489299629.83938811 The angle A C D inquired. tn 88…
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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-149-83.webp)
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