20 June

1948 - First stored-program run

On 20 June 1948, the Manchester Baby ran the first stored program in history.

1837 - Accession of Queen Victoria

On 20 June 1837, Victoria became Queen of the United Kingdom, opening the Victorian era.

1789 - Tennis Court Oath

On 20 June 1789, the Third Estate deputies swore the Tennis Court Oath, a founding act of the Revolution.