Stellarium: A free open-source planetarium for your computer
I haven't figured out the Wayland solution yet, but on X11 you can use a tool called Devil's Pie to make Stellarium act as your desktop background, which is way more fun than any other desktop I've had: <a href="http://mooooo.ooo/stellarium-desktop/" rel="nofollow">http://mooooo.ooo/stellarium-desktop/</a>