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Related to Hipparchus: Ptolemy
astronomer, mathematician, geographer


(hĭpär`kəs), c.555–514 B.C., Athenian political figure, son of PisistratusPisistratus
, 605?–527 B.C., Greek statesman, tyrant of Athens. His power was founded on the cohesion of the rural citizens, whom he consolidated with farseeing land laws. His coup (c.560 B.C.) was probably not unpopular.
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. After the death of his father, he was closely associated with his brother Hippias, tyrant of Athens, in ruling the Athenian city-state. Under Hippias he was a patron of the arts and sponsored the poets Anacreon and Simonides. He was slain by Harmodius and AristogitonHarmodius and Aristogiton
, d. c.514 B.C., Athenian tyrannicides. Provoked by a personal quarrel, the two friends planned to assassinate Hipparchus and his brother, the tyrant Hippias. The plans miscarried; Hipparchus was killed, but Hippias was not hurt.
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 because of his personal vices.


fl. 2d cent. B.C., Greek astronomer, b. Nicaea, Bithynia. He is the first systematic astronomer of whom there are records. He made his observations chiefly on the island of Rhodes. Ptolemy's geocentric theory of the universe was based largely on the conclusions of Hipparchus, a record of whose researches is preserved in the Almagest of Ptolemy. In it Hipparchus is credited with the discovery of the precession of the equinoxes, the eccentricity of the sun's apparent orbit, and certain inequalities of the motions of the moon. He determined the lengths of the seasons and accurately measured the year. He calculated the sizes of the sun and moon using eclipses. He also made the first known comprehensive chart of the heavens giving the positions of at least 850 stars, and he divided them into brightness classes, a system of magnitudes later expanded by Ptolemy. Hipparchus suggested a method of determining longitude by observing the parallax of the moon in eclipse. He is believed to have been the first to make systematic use of trigonometry, and he computed a table of chords roughly equivalent to trigonometrical sines. Only one of his works, a commentary on the work of Aratus and Eudoxus, survives.
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(religion, spiritualism, and occult)

Hipparchus, the preeminent ancient Greek astronomer, lived from approximately 190 b.c.e. to 120 b.c.e. He developed trigonometry, recorded the location of more than a thousand stars, and originated the idea of latitude and longitude. He is said to have discovered the phenomenon known as the precession of the equinoxes. Hipparchus was also a practicing astrologer.

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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



Born circa 180-190 B.C. in Nicaea; died 125 B.C. in Rhodes. Ancient Greek scientist; one of the founders of astronomy.

Hipparchus carried out the first systematic observations and investigations of the sky. He worked out the theory and compiled tables of the motions of the sun and moon, as well as a table of solar eclipses. This work was based on a geocentric system; Hipparchus rejected the idea of heliocentricism as a hypothesis without sufficient proof. He described lunar motion at full and new moon and rather accurately estimated the distance between the moon and the earth. Circa 129-127 B.C. he compiled a catalog, which was enormous for those times, of the positions of 850 stars, classifying the stars according to brightness into a system of six magnitudes. Comparing his positions of the stars with earlier ones (third century B.C.), Hipparchus discovered the phenomenon of precession and rather accurately estimated its magnitude. In connection with this, he determined the length of the tropical year (with an error of no more than 6 minutes) and its difference from the sidereal year (15 minutes; at present, 20 minutes). Hipparchus determined the inclination of the equator to the ecliptic, with an error of 5’. He introduced the geographical coordinates of latitude and longitude. His works in the original have not been preserved. The principal source of information on his work is Ptolemy’s Almagest.


Seleshnikov, S. I. Astronomiia i kosmonavtika. Kiev, 1967.
Eremeeva, A. I. Vydaiushchiesia astronomy mira. Moscow, 1966. Pages 32-34. (List of works about Hipparchus.)


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


(fl. 146–127 B.C.) astronomer who calculated the year and discovered the precession of the equinoxes. [Turkish Hist.: EB, V: 55]
Allusions—Cultural, Literary, Biblical, and Historical: A Thematic Dictionary. Copyright 2008 The Gale Group, Inc. All rights reserved.


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)
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
Hipparchus's constellation descriptions perfectly match those on the Atlas globe.
Hipparchus was ridden by Jack Dowdeswell, who had been champion jockey just after the war.
All the early Greek and Roman writers on astronomy--Aratos, Hipparchus, Geminos, Vitruvius, Manilius--refer to this star-pattern simply as The Kneeler.
(42.) Pausanias (1.23.2) suggests that a bronze lioness statue dedicated by Callias was in honor of the mistress of Aristogeiton (Leaena), who was supposedly tortured by Hippias after the murder of Hipparchus. Gardner (1918, 19-23) suggests that the statue may have been for Elpinice instead, commemorating her efforts to return Cimon from exile.
Andre Fabre, who sent out Pour Moi to win the 2011 renewal, has Harlem, Heredity and Hipparchus for owner Khalid Abdullah.
The Antikythera mechanism, as it is known, was made some time in the first 200 years BC, possibly in Rhodes where the great mathematician Hipparchus may have had a hand in the design.
This progression is called the "precession of the equinoxes," which was possibly discovered for the first time by Hipparchus of Bithynia (flourish ca.
Newton's argument assumed the creative, some claimed absurd, idea that the Commentary of the Greek astronomer Hipparchus (composed ca.
It is even recorded that the fabled Greek astronomer Hipparchus had his own interest in the stars inspired by an observation of a supernova.
In classical times, Hipparchus (ca 150 BC) catalogued a number of stars but no dramatic improvements in accuracy were made until end of the 16th century, when the Danish astronomer Tycho Brahe introduced much improved instruments in his large well-funded observatory located on the island of Hven.
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The ancient Greek astronomer Hipparchus introduced the magnitude system.