Many visualizations for our solar system place the planets on fixed orbits around the sun. Even NASA's "Eyes" app (https://eyes.nasa.gov/) assumes such fixed orbits. However, this simulation program calculates the actual movements of the planets in our solar system. With reallife data, the acceleration is calculated in one-hour steps and the planets are moved. This creates orbits that are constantly changing slightly.
If you would like to try out the simulation yourself soon™: https://samtech.itch.io/solarsystem
and if you want to keep an eye on the development: https://trello.com/b/F8jtD7NQ/solarsystem-simulation