"It appears that Aryabhatta affirmed the diurnal revolution of the earth on its axis, and that he accounted for it by a wind or current of aerial fluid, the extent of which, according to the orbit assigned to it by him, corresponds to an elevation of little more than a hundred miles from the surface of the earth : that he possessed the true theory of the causes of lunar and solar eclipses, and disregarded the imaginary dark planets of the mycologists and astrologers, affirming the moon and primary planets (and even the stars) to be essentially dark, and only illumined by the sun: that he [468] noticed the motion of the solstitial and equinoctial points, but restricted it to a regular oscillation, of which he assigned the limit and the period : that he ascribed to the epicycles, by which the motion of a planet is represented, a form varying from the circle and nearly elliptic : that he recognized a motion of the nodes and apsides of all the primary planets, as well as of the moon j though in this instance, as in some others, his censurer imputes to him variance of doctrine."