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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.
On Aug. 6, 1945, the United States dropped an atomic bomb on the Japanese city of Hiroshima. Another bomb fell Aug. 9 on Nagasaki. Decades later, controversy and misinformation still surround the decision to use nuclear weapons during World War II.n Aug. 6, 1945, the United States dropped an atomic bomb on the Japanese city of Hiroshima. Another bomb fell Aug. 9 on Nagasaki. Decades later, controversy and misinformation still surround the decision to use nuclear weapons during World War II.