CHAP. VII.
_The physical Causes of the Motions of the Planets. The 54
Excentricities of their Orbits. The times in which
the Action of Gravity would bring them to the Sun._
ARCHIMEDES’S _ideal Problem for moving the Earth. The
world not eternal_
Astronomy Explained Upon Sir Isaac Newton's Principles And made easy to those who have not studied mathematics · 第 26 / 275 题