April 17th is the 107th day of the year (108th in leap years) in the Gregorian calendar. There are 258 days remaining until the end of the year. This date is slightly more likely to fall on a Tuesday, Friday or Sunday (58 in 400 years each) than on Wednesday or Thursday (57), and slightly less likely to occur on a Monday or Saturday (56).
1521 – Trial of Martin Luther over his teachings begins during the assembly of the Diet of Worms. Initially intimidated, he asks for time to reflect before answering and is given a stay of one day.
1524 – Giovanni da Verrazzano reaches New York harbor.
1961 – Bay of Pigs Invasion: A group of Cuban exiles financed and trained by the CIA lands at the Bay of Pigs in Cuba with the aim of ousting Fidel Castro.
1969 – Sirhan Sirhan is convicted of assassinating Robert F. Kennedy.
1970 – Apollo program: The ill-fated Apollo 13 spacecraft returns to Earth safely.
Actress Jennifer Garner turns 46
Model and Singer Victoria Beckham turns 44
Game of Thrones Actor Sean Bean turns 59
Actress Rooney Mara turns 33
Actor Luke Mitchell turns 33