Template:Selected anniversaries/July 1
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1819: Johann Georg Tralles discovers the Great Comet of 1819 (C/1819 N1). It was the first comet analyzed using polarimetry, by François Arago.
1841: Poet and detective Jan Kochanowski reprograms the Nebra sky disk to detect and prevent crimes against mathematical constants, .
2001: Physicist and educator Nikolay Basov dies. He did fundamental work in the field of quantum electronics.