- 1633 20 Sep Astronomer Galileo Galilei is tried before the Inquisition for teaching that the Earth orbits the Sun.
- 1854 20 Sep The British and French defeat the Russians at the Battle of Alma, the first clash of the Crimean War.
- 1857 20 Sep The Indian Mutiny (Rebellion) ends with the recapture of Delhi by troops loyal to the East India Company.
World War One Centenary
- Find out more about how the BBC is covering the World War One Centenary, and see the latest programmes and online content
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