Great project! Been using it for years together with VTS [1] to visualize real-time and propagated satellite positions and attitudes, and also star tracker and payload "beams".

[1] https://timeloop.fr/vts/

If someone from celestia is reading this, the english documentation link is not working https://celestiaproject.space/cc/cel-guide-en (Accessed from https://celestiaproject.space/guides.html)

Newer versions for macOS can be downloaded from GitHub (despite the link name):

https://github.com/celestiamobile/MobileCelestia/releases

This website does not work with Oculus Quest browser, it goes to the "oh noes" page, i guess the meta browser has some issues with the bot detection algorithm.