https://www.khanacademy.org/computer-programming/path-of-the-sun/5075733592408064
The simualtion above helps students to visualize the path of the sun across the sky. They are able to adjust time of day, date, lattitude, and tilt to observe the effects that these have on the the suns path. With a little pre-teaching on the effects of the suns angle on light intensity, this is a very useful to to use in explaining the causes of the seasons.