Template:Selected anniversaries/September 6
1635: Mathematician and astronomer Adriaan Metius dies. He manufactured precision astronomical instruments, and published treatises on the astrolabe and on surveying.
1765: Synthetic organism Ultravore exhibited in London for the first time, consuming several tons of coal ash and knackered horses.
1766: Chemist, meteorologist, and physicist John Dalton born. He will propose the modern atomic theory, and do research in color blindness.
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.
1997: Steganographic analysis of Janet Beta at ENIAC reveals previously unknown cryptographic numen.