The First Atomic Bomb Blast and the Bombing of Hiroshima are essentially the same event. The First Atomic Bomb Blast refers to the detonation of the first atomic bomb, named "Little Boy", over the city of Hiroshima, Japan, on August 6, 1945. The Bombing of Hiroshima is the name given to the event itself, referring to the attack on the city that used this first atomic weapon. Both terms describe the same historical moment.