Much less than a mile altitude at detonation for both bombs. Hiroshima: 1900 ft [1] Nagasaki: 1650 ft [2] [1] https://en.wikipedia.org/wiki/Little_Boy https

Much less than a mile altitude at detonation for both bombs. Hiroshima: 1900 ft [1] Nagasaki: 1650 ft [2] [1] https://en.wikipedia.org/wiki/Little_Boy https://en.wikipedia.org/wiki/Little_Boy [2] https://en.wikipedia.org/wiki/Fat_Man https://en.wikipedia.org/wiki/Fat_Man