1) Astronomer 2) Dialogue of Plato 3) Mathematician 4) Stargazer 5) Uranologist
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https://www.crosswordclues.com/clue/hipparchus
[cavalry officer] A hipparchus or hipparch (ἵππαρχος hipparkhos) was the title of an ancient Greek cavalry officer, commanding a hipparchia (unit of about 500 horsemen); two such units were commanded by an epihipparchos. ...
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http://en.wikipedia.org/wiki/Hipparchus_(cavalry_officer)
[dialogue] The Hipparchus (s; Ἵππαρχος), or Hipparch, is a dialogue attributed to the classical Greek philosopher and writer Plato. There is some debate as to the work`s authenticity. Stylistically, the dialogue bears many similarities to the Minos. They are the only dialogues between Socrates and a single anonymous companion; they...
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http://en.wikipedia.org/wiki/Hipparchus_(dialogue)
[lunar crater] This feature is an ancient crater that has been subject to considerable modification due to subsequent impacts. The western rim of Hipparchus has been all but worn away from impact erosion, and only low hills and rises in the surface remain to outline the feature. The wall to the east is somewhat more intact, but it too is he...
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http://en.wikipedia.org/wiki/Hipparchus_(lunar_crater)
(from the article `Harmodius and Aristogiton`) ...advances made by the younger brother of the ruling tyrant Hippias toward his young friend Harmodius. The two friends, with a small band of ...
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http://www.britannica.com/eb/a-z/h/52
Greek astronomer and mathematician who made fundamental contributions to the advancement of astronomy as a mathematical science and to the ... [17 related articles]
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http://www.britannica.com/eb/a-z/h/52
(c. 555-514 BC) Younger son of the Athenian tyrant
Pisistratus, bro ...
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http://www.encyclo.co.uk/local/20688
[
n] - 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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http://www.webdictionary.co.uk/definition.php?query=Hipparchus
son of the tyrant Pisistratus and brother of the tyrant Hippias and Thessalus; Hipparchus was ostracized from Athens in 487 BCE; Cleisthenes promulgated the law of ostracism in 510 BCE and Hipparchus was the first Athenian citizen to be ostracized under the law; Hipparchus was slain by Aristogiton and Harmodius near the temple of the daughters of L...
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https://www.encyclo.co.uk/local/10135
Greek astronomer and mathematician. He invented trigonometry and calculated the lengths of the solar year and the lunar month, discovered the precession of the equinoxes, made a catalogue of 850 fixed stars, and advanced Eratosthenes' method of determining the situation of places on the Earth's surface by lines of latitude and longitude
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https://www.encyclo.co.uk/local/21221
died 514 b.c., tyrant of Athens 527–514. · c190–c125 b.c., Greek astronomer.
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https://www.infoplease.com/dictionary/hipparchus
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