Template:Selected anniversaries/April 11

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  • 1789: Clockmaker Jean-André Lepaute dies. He was an innovator, introducing numerous improvements in clockmaking, especially his pin-wheel escapement, and his clockworks in which the gears are all in the horizontal plane.

    1789: Clockmaker Jean-André Lepaute dies. He was an innovator, introducing numerous improvements in clockmaking, especially his pin-wheel escapement, and his clockworks in which the gears are all in the horizontal plane.

  • 1798: Physicist and academic Macedonio Melloni born. Melloni will demonstrate that radiant heat has physical properties similar to those of light.

    1798: Physicist and academic Macedonio Melloni born. Melloni will demonstrate that radiant heat has physical properties similar to those of light.

  • 1914: Mathematician Dorothy Lewis Bernstein born. She will be the first woman to be elected president of the Mathematics Association of America.

    1914: Mathematician Dorothy Lewis Bernstein born. She will be the first woman to be elected president of the Mathematics Association of America.

  • 1962: Physicist and academic Ukichiro Nakaya dies. He created the first artificial snowflakes.

    1962: Physicist and academic Ukichiro Nakaya dies. He created the first artificial snowflakes.

  • 1980: Viking program: After operating on the surface of Mars for 1316 days (1281 sols), the Viking 2 lander is turned off when its batteries fail.

    1980: Viking program: After operating on the surface of Mars for 1316 days (1281 sols), the Viking 2 lander is turned off when its batteries fail.

  • 2017: Dennis Paulson calls for a moment of silence in recognition of the thirty-seventh anniversary of NASA switching off the Viking 2 spacecraft.

    2017: Dennis Paulson calls for a moment of silence in recognition of the thirty-seventh anniversary of NASA switching off the Viking 2 spacecraft.

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