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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 -- 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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