Herschel, John F. W. (John Frederick William), Sir, 1792-1871 · London : Longman, Rees Orme · leaf 339
thamoons orbit, moving round thesmall circle A B C1) in 19 years ;a the pole of the earths equator,which at each moment of its pro-gress has a direction perpendicu-lar to the varying position of theline A a, and a velocity depend-ing on the varying intensity ofthe acting causes during the… … CHAP. XI. NUTATION. 333 node, have arrived at c, having described not an exactly-circular arc, but a single undulation of a wave-shapedor epicycloidal curve., a b cde} with a velocity alternatelygreater and less than its mean motion, and this will berepeated in every succeeding revolution of 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-325-217.webp)
