||The use of lunar calendar by the Sumerains.
|3000BC - 2500BC
||A solar calendar is used in Egypt.
||The Babylonians adopted the use of a better
form of lunar calendar.
||The earliest astronomical observations are
made by Chinese and Babylonian astronomers including the observations of
comets and constellations.
||Mathematics was used to plot planetary
positions. The stellar constellations were identified.
||Early Greek philosopher visualises rational
theories of the universe. The concept of infinity was introduced into
cosmology by Anaximander.
||Aristotle devised fully comprehensive
cosmology with a rational account of all physical phenomena.
||A Supernova explosion is recorded by
||The idea of a sun centred universe is
proposed by Greek astronomer Aristarchus of Samos.
||Earth’s circumference is calculated by
Greek astronomer Eratosthenes of Cyrene.
||Erathosthenes of Cyrene estimates the
circumference of the Earth, close to current estimation
|200BC - 100BC
||Hipparchus constructed the most accurate
ancient star catalogue.
||The precession of the equinoxes is
discovered by the Greek astronomer Hipparchus of Nicaea.
|100BC - 100AD
||Greek astronomy perfected by Ptolemy whose
system was that Earth was the centre of the universe.
Aristarchus of Samois argues Sun is the centre of the Solar
||Earth centred theory of the universe is put
forward by the Greek-Egyptian astronomer Ptolemy in his book called the
||Ptolemy (Egyptian astronomer) develops his
theory of Earth is the centre of the Solar System. (the dominant theory
of the middle age)
||Moons of Jupiter are discovered by Chinese
astronomers using the naked eye.