Astronomical Contributions By HauntHenge 100 Aboriginals realised that the Southern Cross can be used for navigation using Dreamtime stories. 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. Mar 21, 1492 Copernicus made the heliocentric model Mar 2, 2022 Al-Khwarismi was the creator of Algebra.