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13,000 BCE
Big Bang
Between 13 and 20 billion years ago occured -
2000 BCE
First Solar-Lunar calendar
First solar-lunar calendar was made in Egypt -
280 BCE
Earth´s first theory of translation
Aristarchus suggests that the earth revolves around the Sun -
240 BCE
Eratosthenes measures Earth
Erathostenes measures the circumference of the Earth with extremely exactitude -
140
Ptolomy suggests a theory
Ptolomy suggests that the Sun revolves around the Earth -
Sep 6, 1054
Supernova
Chinese astronomers observe supernova in Taurus -
Sep 6, 1120
First observatory
Construction of an observatory in Cairo was begun in 1120 A.D. This is possibly the first observatory built in Medieval Islam. Unfortunately, the patron of the observatory was found guilty of several crimes including communication with Saturn, and was sentenced to death. The observatory was then destroyed in 1125 A.D. and the personnel were forced to flee for their lives. -
Sep 6, 1543
Copernicus suggests a theory
Copernicus publishes his heliocentric theory of the Universe. -
Galileo Galileo makes a telescope
Galileo uses telescope for astronomical purposes. He discovers 4 Jovian moons, the Moon's craters and the Milky Way galaxy. -
Christian Huygens
Christian Huygens discovers Saturn's rings and Titan, the fourth satellite of Saturn. -
Ice on Mars
Martian polar ice caps are noted by Cassini. -
First reflective telescope
The first reflecting telescope was built by Newton. -
Speed of light
Danish astronomer Ole Romer measures the speed of light -
Gravity law
Newton publishes his theory of universal gravitation in the work Philosophiae Naturalis Principia Mathematica. This is seen to be the start of Modern Astronomy. -
Sputnik
Sputnik, first object to orbit the Earth, launched by the Russians.
