Pg.+10

=== ||~  P aige H. Pg. 10 || ===

 1. The ancient civilization which gave rise to our modern calendar was the early Roman civilization. The early Roman calendar had 365 days in a year, and seven days in a week.  2. The advantage that Galileo Galilei had over the other astronomers was that he was the first person who used a telescope. Having that advantage, he discovered four moons orbiting Jupiter. He also discovered craters, mountains on the moon, sunspots on the sun, and phases of Venus. It showed Galileo that the planets are more than lights; that they are physical bodies like the earth.  3. Copernicus’s theory is not completely correct, though it's pretty close to being so. His theory states that the sun is at the center of the universe and the planets, including the Earth, orbit the sun. All our planets do orbit the sun, but we have been led to believe that the sun is not completely centered between all the planets, including Earth. True, the Earth orbits the sun, but the sun is only the center of our solar system, not the entire universe.