| Y/M/D | Description | Place |
|---|---|---|
| 1945/07/16 | World's first detonation of a nuclear weapon | Trinity Site, White Sands Missile Range |
| 1945/08/06 | The United States Air Force, Boeing B-29 Superfortress, 'Enola Gay', piloted by Col Paul W Tibbets drops Little Boy, a uranium gun-type atomic bomb, on the Japanese city of Hiroshima. | Hiroshima Peace Memorial (Genbaku Dome), Hiroshima |
| 1945/08/06 | American President Harry S Truman calls for Japan's surrender, warning to "expect a rain of ruin from the air, the like of which has never been seen on this earth." | |
| 1945/08/09 | The Fat Man, a plutonium implosion-type bomb, is dropped by The Great Artiste over Nagasaki's industrial valley. | |
| 1945/08/16 | Ten days after the bombing of Hiroshima, Japan announces its surrender to the Allies. | Hiroshima Peace Memorial (Genbaku Dome), Hiroshima |
| 1949/09/03 | A US Air Force reconnaissance plane flying over the North Pacific picks up radioactive particles that had drifted from Central Asia. Analysis by J R Oppenheimer and others determines that the USSR had tested an atomic bomb between August 26 and 29. | Northern Pacific, |
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