Template:Selected anniversaries/July 1
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1818: Mathematician and astronomer Jan Kochanowski uses the Nebra sky disk to preview the Great Comet of 1819.
1819: Johann Georg Tralles discovers the Great Comet of 1819 (C/1819 N1). It was the first comet analyzed using polarimetry, by François Arago.
2001: Physicist and educator Nikolay Basov dies. He did fundamental work in the field of quantum electronics.