In third grade, students study about the movements of the moon and planets around the sun. They learn that the reason that the earth has seasons is because of the fact that the earth moves in an orbit around the sun, and it is tilted on its axis. To assist in their understanding of this fact, they construct animations using Frames by Tech4Learning
Reason For Seasons Animation
They also study about the movements of the moon. They understand that the moon moves in a circular orbit around the earth, and that the moon appearance is different in the night sky, depending upon the location of the earth, sun, and moon.
Moon Phases Animation