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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.
The U.S. attacked Japan on August 6, 1945 using a gigantic, atomic bomb, codename âLittle Boyâ, that was equivalent to 20,000 tons of TNT. The bomb was dropped in Hiroshima and destroyed the city, killing thousands of civilians.he U.S. attacked Japan on August 6, 1945 using a gigantic, atomic bomb, codename âLittle Boyâ, that was equivalent to 20,000 tons of TNT. The bomb was dropped in Hiroshima and destroyed the city, killing thousands of civilians.