Philosophical instructor, or, Webster's elements of natural philosophy : subdivided into principles and illustrations ; intended for academies, medical schools, and the popular class-room (1824)
Eaton, Amos, 1776-1842, Webster, John, fl. 1804-1824 · Albany : Printed by Websters and Skinners ... · leaf 205
the heavensto half of the earths orbit c b n. Thus, the line f hdivides the ecliptic into two equal parts, and the el-liptical orbit of the earth into two unequal parts ; thegreater part cad is that which the earth describesin summer, and the less is its winter course. Besidethese unequal divisions… … THE MOONS MOTION. 203 winter than in summer ; for the sun is considerablynearer the earth whilst the earth passes through thewinter signs c b d, than whilst it passes through thesummer signs d a c. It may naturally be asked, why the winter is colderthan the summer, as the sun is nearer the earth ?…
Physics
Internet Archive · Medical Heritage Library · 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-24-10.webp)