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100
Aboriginals realised that the Southern Cross can be used for navigation using Dreamtime stories.
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105
Ptolemy developed a model that predicted the movements of the Sun, Moon, planets and stars.
Correctly predicted a solar eclipse and brought lots of astronomical information from other cultures to Greece. -
Jan 1, 1076
Omar Khayyam created the pre-Gregorian calendar and calculated today's year.
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Mar 21, 1492
Copernicus made the heliocentric model
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Al-Khwarismi was the creator of Algebra.