HistoryWorld - Astronomy Timeline

HistoryWorld Timeline

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		c. 450 BC
		The followers of Pythagoras maintain that the earth revolves on its own axis and moves in an orbit

		c. 350 BC
		Eudoxus of Cnidus proposes the concept of transparent spheres supporting the bodies visible in the heavens

		c. 270 BC
		On the small Greek island of Samos an astronomer, Aristarchus, comes to the startling conclusion that the earth is in orbit round the sun

		c. 140 BC
		The Greek astronomer Hipparchus is credited with the invention of the astrolabe, measuring the angle of sun or star above the horizon

		c. 130 BC
		The Greek astronomer Hipparchus, mapping the stars, observes but cannot explain the precession of the equinoxes

		129 BC
		Hipparchus completes the first scientific star catalogue, mapping some 850 stars

		c. 50 BC
		The Maya introduce a calendar which has a cycle of fifty-two years, known as the Calendar Round

		45 BC
		Julius Caesar's new calendar is introduced, at a time when its predecessor has become out of step with the seasons by three months

		c. 150
		Ptolemy writes in Alexandria an encyclopedic account of Greek scientific theory in cosmology, astronomy and geography

		921
		The Jewish calendar, deriving originally from the example of Babylon, is given its lasting form

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