380: Theodosius I makes his adventus, or first formal entry, into Constantinople
Crabtree watching the Transit of Venus in 1639 by Ford Maddox BrownTransit of Venus

1639: First observation of the transit of Venus by Jeremiah Horrocks and William Crabtree, helps establish the size of the solar system

1642: Dutch explorer Abel Tasman is the first European to discover Van Diemen’s Land (Tasmania)

1859: English naturalist Charles Darwin publishes “On the Origin of Species” radically changing the view of evolution and laying the foundation for evolutionary biology

1950: UN troops begin an assault intending to end the Korean War by Christmas

1954: France sends 20,000 soldiers to Algeria

1974: Most complete early human skeleton (Lucy, Australopithecus) discovered by Donald Johanson, Maurice Taieb, Yves Coppens and Tim White in the Middle Awash of Ethiopia’s Afar Depression

Source: Onthisday.com