• synonyms


[hi-pahr-kuh s]
  1. died 514 b.c., tyrant of Athens 527–514.
  2. c190–c125 b.c., Greek astronomer.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for hipparchus

Historical Examples of hipparchus

  • The first catalogue of the stars of which we have record was that of Hipparchus in 129 b.c.

    The Astronomy of the Bible

    E. Walter Maunder

  • After his death, his sons Hipparchus and Hippias succeeded him in the tyranny.

  • We must however commence, as Hipparchus does, with the southern regions.

  • But the system of Hipparchus altogether teems with difficulties.

  • We will now return at once to Hipparchus, and see what comes next.

British Dictionary definitions for hipparchus


  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)
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  1. a large crater in the SW quadrant of the moon, about 130 kilometres in diameter
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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

hipparchus in Science


  1. 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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.