Peck, William G. (William Guy), 1820-1892 · New York, Chicago, A. S. Barnes & company · leaf 131
ring which the appearancespresented are the same as the ugh the moon had been slightly rocked back andnTv forth around an axis per- pendicular to the plane ofher orbit. Explanation. M and P are theposition? of tbe moon at perigee andapogee ; N and Q, are her positions atthe end of the first aud… … Fig. 52. The Moons Libration in Longitude. 2°. Libration in latitude. This libration is due tothe fact that the axis of the moon is inclined to the plane THE MOOK. 127 of her orbit. When the moon is at either node the planethat limits her visible surface passes through her axis, andconsequently the…
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-317-209.webp)
