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Join the roomHipparchus was a member of the ruling class of Athens and one of the sons of Pisistratus. He was a tyrant of the city of Athens from 528/527 BC until his assassination by the tyrannicides Harmodius and Aristogeiton in 514 BC.
“I have composed a book on the length of the year in which I show that the tropical year contains 365 days plus a fraction of a day which is not exactly 1/4 days as the mathematicians-astronomers suppose, but which is less than 1/4 by about 1/300.”
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Not who you're looking for? Others named Hipparchus: 2nd century Greek astronomer, geographer and mathematician · crater on Mars · dialogue attributed to Plato · cavalry officer in ancient Greece