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The Epic Interactive Encyclopedia 1997
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almagest
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1992-09-02
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19 lines
Arabic al `the' and Greek majisti `greatest'
a book compiled by the Greek astronomer
Ptolemy during the 2nd century AD, which
included the idea of an Earth-centred
universe. It survived in an Arabic
translation. Some medieval books on
astronomy, astrology, and alchemy were given
the same title. Each section of the book
deals with a different branch of astronomy.
The introduction describes the universe as
spherical and contains arguments for the
Earth being stationary at the centre. From
this mistaken assumption, it goes on to
describe the motions of the Sun, Moon, and
planets; eclipses; and the positions,
brightness, and precession of the `fixed
stars'. The book drew on the work of earlier
astronomers such as Hipparchus.