Hipparchus

[ hi-pahr-kuhs ]

noun

1. died 514 b.c., tyrant of Athens 527–514.
2. c190–c125 b.c., Greek astronomer.

Hipparchus

¹

/ hɪˈpɑːkəs /

noun

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

Hipparchus

²

/ hɪˈpɑːkəs /

noun

1. Hipparchus2nd century bc2nd century bcMGreekSCIENCE: astronomer 2nd century bc , Greek astronomer. He discovered the precession of the equinoxes, calculated the length of the solar year, and developed trigonometry
2. Hipparchus514 bcMGreekAthenianPOLITICS: tyrant died 514 bc , tyrant of Athens (527–514)

Hipparchus

/ hĭ-pär′kəs /

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.

Example Sentences

“I think this lays to rest doubts about the existence of Hipparchus’ catalog” and confirms that he was “trying to measure coordinates for all of the visible stars,” says Victor Gysembergh, a historian of ancient science at CNRS in Paris.

From Science News

And when he was unable to do that, Hipparchus would not pay down his silver, until he could make further inquiry.

From Project Gutenberg

This was the number of stars comprised in the Catalogue of Ptolemy, according to the system of Hipparchus.

From Project Gutenberg

Scientific method in the work of Hipparchus meant a very different thing from the scientific method of the Chaldeans.

From Project Gutenberg

One of the tyrants, Hipparchus, was very jealous of Harmodius, because the people loved him so much.

From Project Gutenberg

Statues were raised to Harmodius and Aristogeiton, who slew Hipparchus.

From Project Gutenberg