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==Astronomy== * Completion of [[Paris Observatory]], the world's first such national institution.<ref>{{cite web|url=http://www.paris-walking-tours.com/observatoryofparis.html|publisher=Paris Walking Tours|title=Observatory of Paris|accessdate=2011-05-10}}</ref> * February 27 β The [[Ortenau]] meteorite lands in Germany. * October 25 β Italian-born French astronomer [[Giovanni Domenico Cassini]] discovers [[Iapetus (moon)|Iapetus]], the second known moon of the planet [[Saturn]].
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