Science on the 20th of October in history

Science

Date	Type	Text
20 Oct 1631 Michael Maestlin	science	death Michael Maestlin Michael Maestlin, German astronomer and mathematician (born 1550)
20 Oct 1713 Archibald Pitcairne	science	death Archibald Pitcairne Archibald Pitcairne, Scottish physician (born 1652)
20 Oct 1719 Gottfried Achenwall	science	birth Gottfried Achenwall Gottfried Achenwall, statistician (died 1772)
20 Oct 1743 François Chopart	science	birth François Chopart François Chopart, French surgeon (died 1795)
20 Oct 1868 English	science	English (chemistry) English astronomer Norman Lockyer observes and names the D₃Fraunhofer line in the solar spectrum and concludes that it is caused by a hitherto unidentified element which he later names helium.
20 Oct 1984 Paul Dirac	science	death Paul Dirac Paul Dirac (b. 1902), English-born physicist.
20 Oct 1987 Andrey Kolmogorov	science	death Andrey Kolmogorov Andrey Kolmogorov (b. 1903), Russian mathematician.

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