Wikipedia:Selected anniversaries/July 20
July 20: Independence Day in Colombia (1810)
- 1927 – Five-year old Michael I became King of Romania upon the death of his father Ferdinand I.
- 1940 – Billboard magazine published its first "Music Popularity Chart."
- 1944 – Adolf Hitler survived the July 20 Plot, an assassination attempt led by Claus von Stauffenberg.
- 1960 – Sirimavo Bandaranaike was elected Prime Minister of Ceylon, becoming the world's first elected female head of government.
- 1969 – The Apollo 11 lunar module landed on the Sea of Tranquillity, where Neil Armstrong became the first man to walk on the moon.
- 1976 – The Viking 1 spacecraft landed on Mars.