Johann Franz Encke (23 September 1791 26 August 1865) was a German astronomer. Among his activities, he worked on the calculation of the periods of comets and asteroids ...
Johann Franz Drge or (Johann Frantz Drge) or (Jean Franois Drge) (25 March 1794 Altona, Hamburg, Germany - 3 February 1881 Altona, Hamburg, Germany), commonly referred to by ...