tar, and I its latitude.. s 218 ASTRONOMY. Chap, vii. the same as the revolution of the moons node, and theamount of the variation corresponded with particular situa-tions of the node; and, in short, it was soon discovered thatthe cause of these variations was a slight vibration in theearths axis,… … *# * ** * ** Nutation / 205.) We have shown, in Art. 176, that the attraction fully explain- (,-,-, . edbythethe- °* a body, m, on a ring of matter around a sphere, has theory of gravi- effect of making the plane of the ring incline toward the at-y tracting body. Let B O, Fig. 46, represent 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-361-254.webp)
