Greek astronomer Hipparchus

Hip·par·chus¹ (h

-pär

s) Died 514 b.c.

Athenian tyrant (527-514) who ruled with his brother Hippias and was assassinated.

Hip·par·chus² (h

-pär

s) fl. second century b.c.

Greek astronomer who mapped the position of 850 stars in the earliest known star chart. His observations of the heavens form the basis of Ptolemy's geocentric cosmology.

Hipparchus [hɪˈpɑːkəs]

(Astronomy) a large crater in the SW quadrant of the moon, about 130 kilometres in diameter

Hipparchus¹

1. (Biographies / Hipparchus (2nd century bc-2nd century bc) M, Greek, SCIENCE: astronomer) 2nd century bc, Greek astronomer. He discovered the precession of the equinoxes, calculated the length of the solar year, and developed trigonometry

2. (Biographies / Hipparchus (death date: 514 bc) M, Greeknational of birth: Athenian, POLITICS: tyrant) died 514 bc, tyrant of Athens (527-514)

Hipparchus also Hipparchos (h

-pär

s) 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.

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Noun

Hipparchus - 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 Hipparchus

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Hipparchus (redirected from Greek astronomer Hipparchus)

Hipparchus
(redirected from Greek astronomer Hipparchus)