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Updated: May 26, 2025
His determination of the planetary orbits was accomplished by comparing his own observations with those of former astronomers, among them the observations of Timocharis on the planet Venus. His pupil, Hero, improved it by giving it two cylinders. There, too, the first steam-engine worked. This also was the invention of Hero, and was a reaction engine, on the principle of the eolipile.
The many-times written history of the application of steam, from the time of the eolipile of Hero of Alexandria to the heroic period of Newcomen and Watt, and the improvements made since their time, is one proof of the statement.
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