Wikipedia:Selected anniversaries/April 9
April 9: Palm Sunday in Western Christianity, Education and Sharing day in the United States (2006); Day of Valor in the Philippines.
- 193 - Septimius Severus (statue pictured) 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.
- 1940 - Operation Weserübung: Germany invaded Denmark and Norway; Occupation of Denmark began.
- 1959 - NASA announced the selection of the Mercury Seven, 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.