Respuesta :
Galileo’s telescopic discoveries of the moons of Jupiter are often mentioned. But they did not amount to proof that the Ptolemaic system was incorrect.
They led to an interesting suggestion, but it did not remove the strong arguments against the motion of the Earth. Apart from the fact that many people looking through Galileo’s telescopes did not see what he saw, and instead had all sorts of illusions, like seeing the moon to the side of the tube.
Keep in mind, in addition, that Galileo built his telescopes for his eyes. Other observers could not adjust the focus. Galileo’s main contribution was a theoretical one: He showed that Aristotle’s arguments against the motion of the Earth were fallacious.
Aristotle argued, for example, that if we drop a stone from the top of a tall tower, it would fall down straight and hit the ground near the bottom of the tower. If the Earth moved, however, it would carry the tower with it.
This meant that the stone would hit the ground at some considerable distance from the base of the tower. Or that the stone could not fall straight. But we do see the stone fall straight and hit the ground near the base of the tower.
Therefore, the Earth could not move. Plain observations proved that. Not so, said Galileo in “The Second Day” of his Dialogues Concerning the Two Chief World Systems.
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