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| c. 150 |
| | | Ptolemy writes in Alexandria an encyclopedic account of Greek scientific theory in cosmology, astronomy and geography | |
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| 921 |
| | | The Jewish calendar, deriving originally from the example of Babylon, is given its lasting form | |
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| 1054 |
| | | Astronomers in China and Japan observe the explosion of the supernova which is still visible as the Crab Nebula | |
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| 1066 |
| | | Halley's comet, appearing in the Normans' annus mirabilis, is later depicted in the Bayeux tapestry | |
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| 1543 |
| | | Polish astronomer Nicolaus Copernicus publishes a book suggesting that the earth moves round the sun | |
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| c. 1576 |
| | | Danish astronomer Tycho Brahe builds Uraniborg, on the island of Hven, and makes it the world's leading observatory | |
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| 1582 |
| | | The new and more accurate Gregorian calendar is introduced by Gregory XIII in the papal states | |
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| 1596 |
| | | Tycho Brahe enters the service of the emperor Rudolf II in Prague, where he invites Johannes Kepler to join him | |
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| 1609 |
| | | Johannes Kepler, in Prague, puts forward the radical proposition that the planets move in elliptical rather than circular orbits | |
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| 1610 |
| | | Galileo, with his new powerful telescope, observes the moons of Jupiter and spots moving on the surface of the sun | |
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