Wikipedia:Selected anniversaries/April 9
April 9: Easter Monday in Christianity (2007); Day of Valor in the Philippines.
- 193 - Septimius Severus was proclaimed Roman Emperor.
- 1865 - Battle of Appomattox Courthouse: Confederate forces under Robert E. Lee surrendered to Union commander Ulysses S. Grant, effectively ending the American Civil War.
- 1917 - World War I: The Canadian Corps began the first wave of attacks in the Battle of Vimy Ridge, advancing behind a creeping barrage known as the 'Vimy Glide'.
- 1959 - NASA announced the selection of the Mercury Seven (pictured), the first astronauts in Project Mercury.
- 1989 - April 9 tragedy: An anti-Soviet demonstration in Tbilisi, Georgia was quashed by the Soviet army, resulting in 20 deaths and thousands of injured.