Astronomy in Minecraft

Stellaria

Look up! Across multiple galaxies, count stars and form constellations all with unique names and descriptions; small pieces of lore to bring the history to another level.

Discoveries are saved per world. Chart a constellation on your survival save? It stays charted there; join a friend's server and that sky is unmapped again, waiting for you to go astronom...izing.... ;)

Singleplayer/Multiplayer

This mod has a standalone MOD jar for individual users, and a PLUGIN to synchronize lunar events/constellations for multiple users with the mod on a server.

Galaxies

Galaxies are fresh every three days, which add to a different section in your Starbook. Discover all 80+ constellations over 6 galaxies to complete your Starbook and Starmap.

Stellaria is client-side. It works on any server, vanilla or modded, with nothing installed on the other end.

Access your Starbook and Starmap using the B key, which is rebind-able through Keybinds.

Multiplayer

For servers that want everyone under the same sky, there's an optional Stellaria-Paper plugin. It syncs which night and galaxy the server is on, so every player sees the same constellations regardless of when they last logged in.

"So go; wild one, lay your eyes on some radical freaking stars bro 

-Unknown" -Lua