Differences of temperature and density of the parts of the original mass account for the eccentricity of orbits, and deviations fro m the plane of the equator. 李贝.西洋科学史.
By Flamsteed, the first Royal Astronomer, were supplied more accurate data for the determination of planetary orbits. 李贝.西洋科学史.
It was thus that the hypothesis that the planets move in circular orbits, recommended by its simplicity and ?sthetic quality, was forced to give way to the hyp othesis of elliptical orbits. 李贝.西洋科学史.
Around this the suns keep their orbits harmoniously, all apparent irregularities arising from our eccentric view. 李贝.西洋科学史.
At the same time the book contains interesting conjectures in reference to the relati on of earthquakes and volcanoes, and to the fact that comets travel in fixed orbits. 李贝.西洋科学史.