People had different ideas about the shape of the earth. Most said it was flat but later came to know that it was not. The earth is a member of the Solar System.
It is a large ball made of rock, soil, and water.
The earth goes around the sun, and the journey takes 365 days. While making that journey it spins on its axis. It takes 24 hours to complete each spin. This spin gives us the day and night.
When the part we live faces the sun, it is daytime for us. When it is turned away, it is the night time. People once believed that the sun goes around the earth.
Galileo and Copernicus proved that the belief was wrong. They said that the earth goes around the sun.