1995: On 1 January 1995, Finland joined the European Space Agency as a full member.
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1801: On 1 January 1801, the Italian astronomer Giuseppe Piazzi discovered Ceres, the first and largest asteroid.
The discovery of Ceres followed that of the planet Uranus, made in 1781 by Sir William Herschel. Piazzi's discovery confirmed the so-called 'Titius-Bode's law', which assumed the existence of a 'fifth planet' between the orbit of Mars and Jupiter. Later the German astronomer Johann Olbers discovered other 'small planets', which the astronomical community came to call 'asteroids'.
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30 December
28 December
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