The phenomena and order of the solar system (1843)
Nichol, J. P. (John Pringle), 1804-1859 · New York : Dayton & Newman · leaf 98
I. The nature of the path in which the planets movearound the Sun being now ascertained, and the Copemi-can system freed from the incumbrance of a supposed ne-cessary circular motion, a new question was stirred inKeplers mind. The ancients supposed, not only that ce-lestial motions were circular,… … 78 THEORY PERFECTED. acccording to some law which had still to be ascertained.The discovery of the principle of this variation was our as-tronomers second great achievement; and he owed it alsoto the facts established by Tycho. It will be easily under-stood. Let S be the Sun, and the elliptic curve…
Solar system
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