Similarly, Galileo is also said to have conducted experiments with falling bodies where he dropped balls of different mass from the Leaning Tower of Pisa. orbiting the Sun), but observers standing on its surface would not be immediately aware of it. This argument was a way of showing how the Earth could be moving through space (i.e. Furthermore, if the person on the deck were to drop a ball on their foot, it would appear to be falling straight down (when in fact, it would be traveling forward with the ship as it fell). To an observer below the deck, Galileo reasoned, it would not be clear whether the ship was moving or stationary. To illustrate, he used an example of a ship traveling at a constant speed on smooth water. He first described this principle in his 1632 treatise Dialogue Concerning the Two Chief World Systems, which was his defense of Copernicus' heliocentric model.
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