The Dogulean Planetarium is an interactive solar system simulation. You can travel through time and space to see planets and moons from close up and watch events like eclipses and equinoxes as they happen.
These YouTube videos show some of the things that you can do:
The Dogulean Planetarium YouTube Channel has more videos.
If the Planetarium doesn't seem to work on your device, see the Requirements page to find out if your system is supported. If it should be supported but still has problems, look at Troubleshooting, further down on that page.
When you want more, continue with The Basics and then Advanced.
Open it in another tab or, better, window and then press where it says Press Here, up above.