An introduction to astronomy : designed as a text book for the students of Yale College (1846)
Olmsted, Denison, 1791-1859, Yale College (1718-1887) · New York : Collins, Brother & Co. · leaf 89
,HO the horizon, S the place of „. „„ ■ rig. 26. the object on the 6 oclock hourcircle PSP, which of course cutsthe equator in the east and westpoints, and ZSB the vertical cir-cle passing thiough the body.Then in the right angled triangleSBA, the given quantities areAS, which is the… … * Degrees are converted into hours by multiplying by 4 and dividing by 60. ASTRONOMICAL PROBLEMS. 65 upon the six oclock hour circle of Greenwich, lat. 51° 28 40 N.on the first of April, 1822 ; its declination being 20° 6 50 N. ? For the Altitude. Rad. sin. BS=^sin. AS sin. ARad. . . 10.Sin. 20° 06…
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-87-64.webp)
