Template:Selected anniversaries/September 6
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1635: Mathematician and astronomer Adriaan Metius dies. He manufactured precision astronomical instruments, and published treatises on the astrolabe and on surveying.
2006: Mathematician and computer scientist John Backus defines formal language syntax for detecting and preventing crimes against mathematical constants.
2007: Writer Madeleine L'Engle dies. She wrote the Newbery Medal-winning A Wrinkle in Time and its sequels.
2008: Signed first edition of Ultravore illstration sells for five hundred thousand dollars.