20 April 1903 discovery of 508 Princetonia

20 April 1904 discovery of 532 Herculina

20 April 1914 discovery of 786 Bredichina and 787 Moskva

20 April 1950 discovery of 1575 Winifred

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20 April 1918 Birth of Kai Manne Börje Siegbahn

20 April 1992 Death of Llewellyn Hilleth Thomas

20 April 1997 Death of John Henry Barrows Irwin in Tucson, Arizona, USA

20 April 2000 Death of Philip Childs Keenan in Columbus, Ohio, USA

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Chronology