Nagasaki City had been added just 2days before Potsdam Declaration on July 26

   In July 1945, a satellite image of Nagasaki City had been formulated by combining a number of aerial photographs like a mosaic for a strategy plan to drop the Atomic Bomb. At first, Nagasaki City had been added one of target plans just 2days before Potsdam Declaration on July 26. The standard map No.90.36-546 for the Fat Mann (F31) to Mitsubishi Steel & Arm Works had been planned to be exploded. The point of the fall where was near from Tokiwa to Nigiwai Bridge in the center of Nagasaki City, was designated as No.114601 on the Map. It had shown a bombing zone from 2,5Km north and 1.5Km south. The concentric explosion within a radius of 70,00 feet (2.13 Km) from the center of the Bridges. Aerial photographs had been confidential documents for pilots of Box Car (V-77), bombers and patrols.The center point on August 9 exploded at 171 Matsuyama-cho, about 3.4 Km north-northwest from the bombing plan.