1799 – Born in Memel in the Kingdom of Prussia on the 22nd of March.
1823-1837 – He was the head of the Finnish observatory at Turku then at Helsinki.
1859 – He was responsible for the star catalogue known as the Bonner Durchmusterung.
1863 – He founded an international organization of astronomers named the Astronomische Gesellschaft.
– Argelander won the Gold Medal of the Royal Astronomical Society.
1875 – Died on the 17th of February.