The night sky is one of the most beautiful sights in nature. Imagine looking up and seeing all those points of light, and not knowing what they are. How could you detect the planets amongst all those stars. Stars generate their own light so they shine bright, but a planet reflects the light from the Sun and still appears as a star.

Egyptians carefully watched the Sun for years and recorded the sunrises and sunsets. They were the first to record that the position of stars in the heaven repeats after 365 sunrises and sunsets. They realized that there are 7 planetary bodies that moved, the Sun, the Moon, and 5 planets. They believed the planets to be gods whose movements would reveal themselves sometimes in the future.