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Updated: May 6, 2025
In the meantime Timocharis, Aristyllus, and Conon had each added their mites to the discoveries of Eratosthenes: but to Hipparchus we owe that theory of the heavens, commonly called the Ptolemaic system, which, starting from the assumption that the earth was the centre of the universe, attempted to explain the motions of the heavenly bodies by a complex system of supposed eccentrics and epicycles.
The principal ray-systems are those of Tycho, Copernicus, Kepler, Anaxagoras, Aristarchus, Olbers, Byrgius A, and Zuchius; while Autolycus, Aristillus, Proclus, Timocharis, Furnerius A, and Menelaus are grouped as constituting minor systems. Many additional centres exist, a list of which will be found in the appendix. The rays emanating from Tycho surpass in extent and interest any of the others.
There were magical brazen circles and sun-dials for fortune-telling in its porch; every one said that they had once belonged to Pharaoh or the conjurors who strove with Moses. Alas! no one of the ferocious bigots knew that with these Eratosthenes had in the old times measured the size of the earth, and Timocharis had determined the motions of the planet Venus.
I cannot do more than merely allude to the treatises on Conic Sections and on Maxima and Minima by Apollonius, who is said to have been the first to introduce the words ellipse and hyperbola. In like manner I must pass the astronomical observations of Alistyllus and Timocharis.
He was for eighteen years at the head of one of the Alexandrian schools. Timocharis, the astronomer, made some of his observations at Alexandria in the last reign, and continued them through half of this reign.
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