History of the planetary systems from Thales to Kepler (1906)
Dreyer, J. L. E. (John Louis Emil), 1852-1926 · Cambridge University Press · leaf 349
ntre of the excentric, so thatMercury is at k every six months, when the earth is at a or 6and the centre of the excentric at n, and at I whenever themean heliocentric longitude of the earth differs 90° from thelongitude of the apsides of Mercury, while i goes round theexcentric in 88 days.… … when at il, almost in the same manner as may be seen in theepicycle of the moon ; but what in the case of the moon isdone in the circumference, that occurs at Mercury in thediameter by reciprocal motions, composed of equal ones; andhow this is done we have seen above when dealing with the 1…
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-214-129.webp)
