Not by 3,000 years. The ancient Babylonians and Egyptians were arguably the "first astronomers", although possibly even earlier civilizations might deserve the title.
He was not the first astronomer; there were plenty before him going back to the Babylonians at least. Galileo, however, was the first to use a telescope.
Galileo I am not so sure he was the first, but he is the most famous.
Galileo.
Galileo
Galileo Galilei
Galileo.
The Italian astronomer and physicist Galileo wrote the first scientific description of the moon
Galileo in 1609
Galileo Galilei was the first astronomer to see the phases of Venus in 1610, providing evidence for the heliocentric model of the solar system proposed by Copernicus.
Probably Galileo Galilei (Astronomer and Physicist, 1564 -1642)
Galileo Galilei (from italy)
Galileo was the first astronomer to explain why the sun and starts travel across the sky