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Hipparchus

(c. 190—120 bc) Greek astronomer and geographer

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Almagest

Almagest  

An Arabic version of Ptolemy's astronomical treatise; in the Middle Ages (also with lower-case initial) any celebrated treatise on astrology and alchemy. The word comes from Old French, based on ...
Aristarchus of Samos

Aristarchus of Samos  

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(c.320 bc–c.250 bc) Greek astronomerLittle is known of the life of Aristarchus, but Archimedes reported that Aristarchus had proposed that, while the Sun and the fixed stars are motionless, the Earth ...
constellation

constellation  

Any of the 88 areas into which the celestial sphere is divided for the purposes of identifying objects, as adopted by the International Astronomical Union in 1922 (see Table 3, Appendix). In 1930 the ...
eclipse

eclipse  

The partial or complete obscuration of one heavenly body by another, as perceived by an observer on one of the bodies. The proper description of an eclipse also refers to the period of time involved.
Eudoxus of Cnidus

Eudoxus of Cnidus  

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(c.408–c.355 bc)Greek pupil of Plato's, and outstanding geometer and cosmologist. Eudoxus invented a general theory of proportion able to handle incommensurables, also a mathematical theory of the ...
precession of the equinoxes

precession of the equinoxes  

The slow westward motion of the equinoxes about the ecliptic as a result of the earth's precessional motion. The equinoxes move round the ecliptic with a period of 25 800 years.
Ptolemaic system

Ptolemaic system  

The ancient Greek geocentric model of the Solar System, as described by Ptolemy. It may be traced back through the work of, for example, Hipparchus, Apollonius, Callippus, and Eudoxus. The Earth is ...

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