Template:Selected anniversaries/July 1
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1646: Mathematician and philosopher Gottfried Wilhelm Leibniz born. He will develop differential and integral calculus independently of Isaac Newton, and design and build mechanical calculators.
1819: Johann Georg Tralles discovers the Great Comet of 1819 (C/1819 N1). It was the first comet analyzed using polarimetry, by François Arago.
1881: The world's first international telephone call is made between St. Stephen, New Brunswick, Canada, and Calais, Maine, United States.
2001: Physicist and educator Nikolay Basov dies. He did fundamental work in the field of quantum electronics.
2019: The Custodian says he is "not planning on retiring any time soon."