Reason for Seasons is an interactive simulation for USA K-5 Elementary school Science .this is the best way to learn while playing. The earth is continuously moving! It is spinning on its axis or the imaginary line that goes through the North Pole to the South Pole. One complete spin of the earth takes 24 hours and it’s why we have night and day. The earth also orbits around the sun. It takes one year and it is the reason we have seasons. Take a look at the earth moving around the sun.