. . . "Johann Franz Encke"@en . . . "Johann Franz Encke (23 September 1791 \u2013 26 August 1865) was a German astronomer. Among his activities, he worked on the calculation of the periods of comets and asteroids, measured the distance from the earth to the sun, and made observations of the planet Saturn."@en . . . . . . "1791-09-23Z"^^ . . "1865Z"^^ . . "1791Z"^^ . "1865-08-26Z"^^ . "Encke, Johann Franz"@en . "German astronomer" . . . .