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Ptolemy (fl. 146—170) Greek astronomer and geographer

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


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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 Arabic, from al ‘the’ + Greek megistē ‘greatest (composition)’.

Subjects: Astronomy and Astrophysics.

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