Timeline
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c. 585 BCETime in which Thales of Miletus lived.
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c. 571 BCE - c. 497 BCELife of Pythagoras of Samos; claim that "number" is the First Cause of existence and the soul is immortal.
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c. 190 BCE - c. 120 BCELife of Hipparchus of Nicea, the ancient Greek mathematician, astronomer and geographer considered the greatest astronomer of antiquity and among the most impressive in world history
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628 CEFirst use of the number zero proposed by Indian mathematician Brahmagupta.