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hipparch.dat
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1994-10-26
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571b
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GREEK HIPPARCHUS: 190-120 B.C.
Hipparchus, circa 190-120 BC, the most outstanding
astronomer of ancient times, made refinements to the
theory of the Sun and Moon based on observations
from Nicaea and the island of Rhodes, and he gave
solar theory essentially its final form. While
working on his catalog of 850 stars, however,
Hipparchus had already recognized the phenomenon
known as the PRECESSION OF THE EQUINOXES, an
apparent slight change in the positions of stars over
a period of hundreds of years caused by a wobble in
the Earth's motion.