 New weapons, however, such as Germany's giant cannons, the "Paris Gun" (Encyclopedia Astronautica) and "Big Bertha," and the V-2 rocket, meant that projectiles would travel hundreds of miles in distance and dozens of miles in height, in all weathers.As a result, variables such as diminished wind resistance in thin atmospheres and changes in gravitational pull reduced accuracy using the historic methodology.There was the additional problem of planes that could now fly hundreds of miles an hour.