Sirimavo Bandaranaike is sworn in as prime minister of Ceylon, becoming the world's first democratically elected female head of government. Date: July 21, 1960 Read more on Wikipedia → 📅 Other events on July 21 📅 Events on this day in 1960 📅 On This Day (Today)

Alaska Airlines Flight 779 crashes near Shemya Air Force Base in Shemya, Alaska killing six. Date: July 21, 1961 Read more on Wikipedia → 📅 Other events on July 21 📅 Events on this day in 1961 📅 On This Day (Today)

Mercury program: Mercury-Redstone 4 Mission: Gus Grissom piloting Liberty Bell 7 becomes the second American to go into space (in a suborbital mission). Date: July 21, 1961 Read more on Wikipedia → 📅 Other events on July 21 📅 Events on this day in 1961 📅 On This Day (Today)

A series of racial riots break out in Singapore. In the next six weeks, 23 die with 454 others injured. Date: July 21, 1964 Read more on Wikipedia → 📅 Other events on July 21 📅 Events on this day in 1964 📅 On This Day (Today)

Apollo program: At 02:56 UTC, astronaut Neil Armstrong becomes the first person to walk on the Moon, followed 19 minutes later by Edwin "Buzz" Aldrin. Date: July 21, 1969 Read more on Wikipedia → 📅 Other events on July 21 📅 Events on this day in 1969 📅 On This Day (Today)

After 11 years of construction, the Aswan High Dam in Egypt is completed. Date: July 21, 1970 Read more on Wikipedia → 📅 Other events on July 21 📅 Events on this day in 1970 📅 On This Day (Today)

The Troubles: Bloody Friday: The Provisional IRA detonate 22 bombs in central Belfast, Northern Ireland, United Kingdom in the space of 80 minutes, killing nine and injuring 130. Date: July 21, 1972 Read more on Wikipedia → 📅 Other events on July 21 📅 Events on this day in 1972 📅 On This Day (Today)

In Lillehammer, Norway, Mossad agents kill a waiter whom they mistakenly thought was involved in the 1972 Munich Olympics Massacre. Date: July 21, 1973 Read more on Wikipedia → 📅 Other events on July 21 📅 Events on this day in 1973 📅 On This Day (Today)

Christopher Ewart-Biggs, the British ambassador to the Republic of Ireland, is assassinated by the Provisional IRA. Date: July 21, 1976 Read more on Wikipedia → 📅 Other events on July 21 📅 Events on this day in 1976 📅 On This Day (Today)

The start of the four-day-long Libyan–Egyptian War. Date: July 21, 1977 Read more on Wikipedia → 📅 Other events on July 21 📅 Events on this day in 1977 📅 On This Day (Today)