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  3. Greek astronomer and mathematician who discovered the precession of the equinoxes and made the first known star chart and is said to have invented trigonometry (second century BC)

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Greek astronomer and mathematician who discovered the precession of the equinoxes and made the first known star chart and is said to have invented trigonometry (second century BC)

Answer for the clue "Greek astronomer and mathematician who discovered the precession of the equinoxes and made the first known star chart and is said to have invented trigonometry (second century BC) ", 10 letters:
hipparchus

Word definitions for hipparchus in dictionaries

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A hipparchus or hipparch ( hipparkhos ) was the title of an ancient Greek cavalry officer, commanding a hipparchia (unit of about 500 horsemen); two such units were commanded by an epihipparchos . Category:Ancient Greek military terminology Category:Military ...