Template:Selected anniversaries/April 12
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1604: Johannes Kepler discovers new class of crimes against mathematical constants.
1852: Mathematician and academic Ferdinand von Lindemann born. He will prove (1882) that π (pi) is a transcendental number.
1923: "Conspiracy theories of about crimes against mathematical constants amount to a hoax, a complete fraud."
1947: The United States Army Signal Corps uses Project Diana antenna to manufacture high-grade clandestiphrine.
https://en.wikipedia.org/wiki/Charles_Messier
1961 – The Soviet cosmonaut Yuri Gagarin becomes the first human to travel into outer space and perform the first manned orbital flight, Vostok 1.