Name three astronomers of the time [MEG 101 Prerestoration]

It's not clear which specific time period you are referring to, but here are three influential astronomers from different periods in history:

Nicolaus Copernicus: A Polish astronomer who lived from 1473-1543, Copernicus is best known for developing the heliocentric model of the solar system, which placed the Sun at the center with the planets orbiting around it. His book "De revolutionibus orbium coelestium" (On the Revolutions of the Celestial Spheres), published in 1543, was a major milestone in the history of astronomy.

Galileo Galilei: An Italian astronomer and physicist who lived from 1564-1642, Galileo is considered one of the most important figures in the scientific revolution. He made significant observations and discoveries using the telescope, including the moons of Jupiter, the phases of Venus, and sunspots. He also developed a mathematical understanding of motion and velocity, and made important contributions to the field of physics.

Johannes Kepler: A German mathematician and astronomer who lived from 1571-1630, Kepler is best known for his three laws of planetary motion. These laws describe the motion of the planets around the Sun in elliptical orbits, and were a major breakthrough in our understanding of the solar system. Kepler also made important contributions to the field of optics and developed the first accurate description of the eye.