21 April 1874 discovery of 137 Meliboea

21 April 1876 discovery of 162 Laurentia

21 April 1901 discovery of 470 Kilia

21 April 1985 discovery of 5318 Dientzenhofer

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21 April 1882 Birth of Percy Williams Bridgman

21 April 1889 Birth of Paul Karrer

21 April 1896 Death of Karl Nicolaus Adalbert Krüger in Kiel, Germany

21 April 1965 Death of Sir Edward Victor Appleton

21 April 1967 Death of André-Louis Danjon in Paris, France

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