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Hipparchus

[hi-pahr-kuh s] /hɪˈpɑr kəs/
noun
1.
died 514 b.c, tyrant of Athens 527–514.
2.
c190–c125 b.c, Greek astronomer.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for Hipparchus

Hipparchus1

/hɪˈpɑːkəs/
noun
1.
2nd century bc, Greek astronomer. He discovered the precession of the equinoxes, calculated the length of the solar year, and developed trigonometry
2.
died 514 bc, tyrant of Athens (527–514)

Hipparchus2

/hɪˈpɑːkəs/
noun
1.
a large crater in the SW quadrant of the moon, about 130 kilometres in diameter
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Hipparchus in Science
Hipparchus also Hipparchos
  (hĭ-pär'kəs)   
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
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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