History of the planetary systems from Thales to Kepler (1906)
Dreyer, J. L. E. (John Louis Emil), 1852-1926 · Cambridge University Press · leaf 347
, to which point,as representing the mean motion of the sun (i.e. of the earth)Copernicus always referred the planetary motions. The centreof the excentric orbit of the planet is at c, while the planetmoves on an epicycle in the same direction and with thesame angular velocity with which its centre… … 33G Copernicus [ch. the excentricity as Ptolemy had done, Copernicus gave f of itto the deferent and let the epicycle account for the rest, butthe result is the same. The planet is at / when the centre ofthe epicycle is at a, at i when the centre is at g, and so on;and, as Copernicus points out,…
Astronomy -- History · Solar system
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
![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-149-83.webp)
