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.