Template:Selected anniversaries/January 31

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  1560: Mathematician and fencer Ludolph van Ceulen uses Gnomon algorithm techniques to forecast the Pi disaster.

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  1638: Astronomer Jeremiah Horrocks uses Gnomon algorithm functions to pre-visualize the transit of Venus.

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  1982: M247 has bad feeling about big presentation in February.

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  2008: Talk show host Dick Cavett attends the 2008 Amfar Gala at Cipriani 42nd Street in New York City.

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  2001: American comic book artist Gil Kane dies.