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While not the inventor of the telescope, Galileo is widely believed to be the first person to use a telescope for astronomy.
Galileo
Galileo was the first person to use a telescope for astronomical research.
Galileo Galilei.
Galileo is the first person that we know of who pointed his telescope up. Or at least, he was the first person who wrote about doing so.
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The first person to use a telescope for astronomical observation was Galileo Galilei in the early 17th century. He made groundbreaking discoveries, such as the moons of Jupiter and the phases of Venus, using his telescope.
Galileo is the first recorded instance of the use of a telescope, though it is well known that he developed the idea for it from a toy that arrived from a traveling merchant.
Galileo perfected the telescope.
That was Galileo in the early 1600s.
Galileo Gailei is the first person credited with using the telescope for astronomical observations. He did not invent the telescope. He is the first to have seen moons going around Jupiter, the rings of Saturn (though he incorrectly identified them), and that the Moon had cliffs and craters.
The first person known to have looked at the heaves through a telescope was Galileo.