Hipparchus [ hi- pahr-k uhs ] SHOW IPA / hɪˈpɑr kəs / PHONETIC RESPELLING noun died 514 b.c., tyrant of Athens 527–514. c190–c125 b.c., Greek astronomer.
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Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022
How to use Hipparchus in a sentence British Dictionary definitions for Hipparchus (1 of 2) noun 2nd century bc, Greek astronomer. He discovered the precession of the equinoxes, calculated the length of the solar year, and developed trigonometry died 514 bc, tyrant of Athens (527–514) British Dictionary definitions for Hipparchus (2 of 2) noun a large crater in the SW quadrant of the moon, about 130 kilometres in diameter
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Scientific definitions for Hipparchus Hipparchus also Hipparchos ( hĭ-pär) ′kəs 190?-120? bce Greek astronomer who mapped the positions of about 850 stars in the earliest known star chart (129 bce). His observations of the heavens formed the basis of Ptolemy's Earth-centered model of the universe. He was also a pioneer of trigonometry.
The American Heritage® Science Dictionary
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