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Ptolemy develops his system for calculating the location of the planets. He publishes a star catalogue with the positions of more than 1000 stars.
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He publishes a book in which he presents an astronomical system with the Earth at the centre of the Universe, the Moon, the Sun, Mars, Jupiter and Saturn in orbit around it and the planets Mercury and Venus in orbit around the Sun.
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The Chinese measure the size of the Earth.
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Copernicus revives Aristarchus’ ideas
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Tycho Brahe sees a supernova and proves that it is just as far away as the other stars.
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Pope Gregory XIII introduces his calendar, which we still use.
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The first satellite in orbit.
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The first person on the Moon.
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Pluto have not longer status as a planet, now it is a Kuiper belt object.
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The Indian astronomer Aryabhata publishes a book in which the rotation of the heavens is explained by saying that the Earth rotates and there is a heliocentric solar system and the planets in elliptic orbits. He determines the length of the year very precisely.