1797 – Born on the 4th of January.
– He built a private observatory with a 9.5 cm refractor in Tiergarten, Berlin.
1830 – Beer and Mädler created the first globe of the planet Mars.
1834-1836 – Produced the first exact map of the Moon entitled Mappa Selenographica.
1837 – Published a description of the Moon Der Mond nach seinen kosmischen und individuellen Verhältnissen.
1839 – Made a map of Mars and calculated its rotation period.
– He worked as a writer and politician.
1849 – Elected as an MP for the first chamber of the Prussian parliament.
1850 – Died on the 27th of March.