-
350 BCE
Aristotle Develops Model of the Universe
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270 BCE
Aristarchus Proposes Heliocentrism
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240 BCE
Eratosthenes Measures Earth's Circumference
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46 BCE
Julian Calendar Adopted
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140
Ptolemy Publishes the Almagest
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499
Aryabhata Proposes Elliptical Orbits
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773
Sanskrit Works Translated into Arabic
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780
Astrolabe Invented
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1126
Islamic and Indian Texts Translated into Latin
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1261
al-Tusi Criticizes Ptolemy
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1543
Copernicus Publishes Heliocentric Model
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1572
Tycho's Supernova
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1576
Tycho Builds Uraniborg
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1582
Gregorian Calendar Adopted
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Kepler Works with Tycho
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Kepler Publishes 3 Laws
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Galileo Publishes Observations with Telescope