Wikipedia:Selected anniversaries/July 20
On July 20: Independence Day in Colombia (1810)
- 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 - Sri Lanka (then Ceylon) elected Sirimavo Bandaranaike Prime Minister, the world's first female head of government.
- 1969 - The Apollo 11 lunar module landed; Neil Armstrong became the first man to walk on the moon.
- 1976 - Viking 1 landed on Mars, marking the first visit from Earth.