A new manual of the elements of astronomy, descriptive and mathematical .. (1868)
Kiddle, Henry, 1824-1891 · New York, Ivison, Phinney, Blakeman & co.; Chicago, S.C. Griggs & co. · leaf 64
erent altitudes from theplace, P; E H, the plane ofthe rational horizon; P h, theplane of the sensible horizon,and E Z, the direction of thezenith. At A, the body beingin the sensible horizon, its ap-parent altitude will be noth-ing ; but if viewed from E, itwould appear to be above thehorizon a… … Questions.—84. Define diurnal arc, and nocturnal arc. Explain Fig.Is the true altitude of a body? 39. 85. What 60 PAKALLAX. a less difference of direction between the lines P n and E o, and when thebody is at C, the centre of the earth, the place of the observer, and the po-sition of the body being…
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-311-203.webp)
