Johannes Hevelius

Johannes Hevelius (in German also known as Hevel; Polish: Jan Heweliusz; (1611-01-28)28 January 1611 – 28 January 1687) was a councillor and mayor of Gdańsk (Danzig), in the Polish–Lithuanian Commonwealth.

Read more in the app

Johannes Hevelius had exceptionally keen eyesight and could see stars of the seventh magnitude. He compiled a "Celestial Atlas" using both instruments, naked eye observations, and observed sunspots to accurately determine the solar rotation