HistoryWorld - Greek science Timeline

HistoryWorld Timeline

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		c. 300 BC
		The Greek author Theophrastus writes On the History of Plants, the earliest surviving work on botany

		c. 300 BC
		Epicurus postulates a universe of indestructible atoms in which man himself is responsible for achieving a balanced life

		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. 250 BC
		Archimedes (it is said) leaps out of his bath shouting eureka ('I have found it') when he perceives how to test for relative density

		c. 220 BC
		The Greek mathematician Eratosthenes calculates the circumference of the world with the help of shadows and camels

		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

		c. 130 BC
		Hipparchus proposes a grid of 360° of latitude and longitude for mapmaking

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

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

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