Galileo was a scientist, mathematician and astronomer. One of the most famous in the world.Particularly the works of astronomy's most famous works. Experiment and discover his many useful ways. Especially in astronomy. Such as the Meet sunspots on the sun And discovered the satellites of Jupiter etc. The characteristics of swing of the objects. Which later developed into the timer. And pendulum clocks Moreover, he can develop a more powerful telescope. Astronomers have made academic progress.