of thesun ), confirming the Newtonian theory of gravity. To show this, let us suppose that theplanets revolve round the sun in circularorbits (which is not far from the truth),and let P ( Fig. 30 ) represent the posi-tion of a planet; F the distance whichthe planet is drawn from a tangent… … SOLAR SYSTEM. 165 If D is the diameter of the orbit and t the time of revolu- Chap, h.tion, then will t=~, ... (1) So for any other planet. If / is the force urging it toward An impor-the sun, a its corresponding arc, Tits time of revolution, and tant troth de- t-»i t i • 1 monstrated. B the radius…
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-187-103.webp)
![An illustration from Divina proportione : opera a tutti glingegni perspicaci e curiosi necessaria oue ciascun studioso di philosophia: prospettiua pictura sculptura: architectura: musica: e altre mathematice: suavissima: sotile: e admirabile doctrina consequira: e delecterassi: co[n] varie questione de secretissima scientia (1509)](https://img.insideoutlibrary.com/img/200/ia-divinaproportion00paci-107-267.webp)
