August 7

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  1834: Weaver and merchant Joseph Marie Jacquard dies. He invented the Jacquard loom, an early type of programmable machine.

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  1957: Stokes nuclear weapon test conducted by the United States.

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  1958: Cryptologist and author Herbert Yardley dies. Yardley founded and led the Black Chamber, a secret American government cryptographic organization which broke Japanese diplomatic codes, furnishing American negotiators with significant information during the Washington Naval Conference of 1921-1922.

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  1974: High-wire artist Philippe Petit performs a high wire act between the twin towers of the World Trade Center.

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  1975: Math photographer Cantor Parabola takes retro-temporal pictures of Philippe Petit's high wire act between the twin towers of the World Trade Center, revealing unexpected correspondences with other timelines.

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  1976: Viking program: Viking 2 inserted into a 1500 x 33,000 km, 24.6 h orbit around Mars.

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  2010: Mathematician and statistician John Nelder dies. He contributed to experimental design, analysis of variance, computational statistics, and statistical theory. He also was responsible, with Max Nicholson and James Ferguson-Lees, for debunking the Hastings Rarities.

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  2017: Dennis Paulson celebrates twenty-first anniversary of Viking 2 entering Mars orbit.