His eyes.
Galileo
A spy glass (telescope).
It was the Italian Galileo.
he made phrases of the moon and first to use a telescope
Galileo
he made phrases of the moon and first to use a telescope
Note that Galileo did not invent the telescope. He was, however, the first person to use a telescope to examine the heavens. Previously, telescopes had only been used to look at distant locations here on Earth.
Galileo first used the telescope to view the Moon in 1609, shortly after he heard about the invention of the telescope in the Netherlands. He constructed his own version of the telescope and made his observations from his home in Padua, Italy. His detailed observations of the Moon revealed its rugged surface and craters, challenging the prevailing notion of its perfection.
Galileo I am not so sure he was the first, but he is the most famous.
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.
Galielo
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.