at Keplers third law, with respect to theplanets, applies also to the satellites of Jupiter. The squares of theirsidereal revolutions are as the cubes of their mean distances from theplanet. The planets Saturn and Uranus are also attended by satellites, andthe same law has place with them. ( 143.)… … Let S (Fig-. 31) represent the sun, J Jupiter, dearth, and m Jupitersfirst satellite. By careful and accurate observations astronomers havedecided that the mean revolution of this satellite round its primary, isperformed in 42 h. 28 m. and 35 s.; that is, the mean time from oneeclipse to…
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-353-245.webp)
