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The bomb exploded over Hiroshima at 8:15 on the morning of August 6, 1945. About an hour previously, the Japanese early warning radar net had detected the approach of some American aircraft headed for the southern part of Japan.
More On This Day. On This Day: United States Drops Atomic Bomb on Hiroshima. On Aug. 6, 1945, U.S. war plane Enola Gay dropped âLittle Boy,â a 8,900-pound atomic bomb, on Hiroshima, Japan. Within eight days, Japan surrendered, ending World War II. The United States and Japan had been at war since 1941.