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Galileo's Dialogue Concerning the Two Chief World Systems considers all the common arguments against the idea that the Earth moves. One of these is that if the Earth is spinning on its axis, then we are all moving to the east at hundreds of miles an hour; hence, a ball dropped from a tower, moving straight down, will fall to the west of the tower, which has moved some distance east in the interim. Similarly, a cannon ball fired to the east will land closer to the cannon than one fired to the west, as the cannon will be moving east and partly catching up with it.