4 April 1858 discovery of 53 Kalypso

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4 April 1688 Birth of Joseph-Nicolas Delisle in Paris, France,

4 April 1914 Birth of Zdeněk Kopal in Litomysl, Czech Republic

4 April 1932 Death of Friedrich Wilhelm Ostwald

4 April 1958 Death of Roscoe Frank Sanford in Pasadena, California, USA

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