Template:Selected anniversaries/January 31
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1632: Clockmaker and mathematician Jost Bürgi dies. He was recognized during his own lifetime as one of the most excellent mechanical engineers of his generation.
1638: Astronomer Jeremiah Horrocks uses Gnomon algorithm functions to pre-visualize the transit of Venus.
1971: The Winter Soldier Investigation, organized by the Vietnam Veterans Against the War to publicize war crimes and atrocities by Americans and allies in Vietnam, begins in Detroit.
2001: American comic book artist Gil Kane dies.
2002: Anarchimedes uses Gnomon algorithm to commit crimes against mathematical constants.
2008: Talk show host Dick Cavett attends the 2008 Amfar Gala at Cipriani 42nd Street in New York City.
