
Caelum Refabricated
Fabric Port: More realistic (and configurable) celestial bodies movement
About this Mod
Caelum Refabricated is a Fabric Port of Caelum. It is a Minecraft mod, that aims to make the Minecraft sky somewhat more realistic. This is done by:
- replacing the Vanilla stars with real-life stars
- adding colors to the stars
- making the Moon move independently of the Sun, making it so lunar phases are actually possible
- making what stars are visible change over the course of the Minecraft year
- rotating the sky based on your latitude - the closer you are to one of the "poles", the lower the Sun is
The mod allows you to:
- choose whether to use the Vanilla or custom stars (or whether to render stars at all)
- add or even replace the custom stars using resource packs
- enable/disable star color (does not apply to Vanilla stars)
- change star size (does not apply to Vanilla stars)
- change the "length of the year" (different stars are visible over the course of the year). Alternatively, you can disable this feature
- change the length of the lunar month
- change whether the player's latitude (z coordinate) affects the entire sky, stars only, or nothing
- change what z coordinates are considered the south and north pole
The 1.20.1 Fabric version of the mod is optional on the server. When installed on the server the Moon Phase will be changed so that it correlates with the Moon phase shown on the client.
The movement of the celestial bodies is an approximation and does not fully reflect the way it works in real-life (both Moon and Earth have perfectly circular orbits, Earth has no axial tilt, etc.)
There are no guarantees made when it comes to compatibility with other mods (especially such that affect sky rendering in any way - such as Optifine).
Available Versions
How to Install Caelum Refabricated on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (1.20.1).
Install Mod
Open the mod browser in the dashboard and search for "Caelum Refabricated". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.20.1
Server-side
~ OptionalRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
Caelum Refabricated server crashes on startup – what to do?
Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.20.1). You can switch loaders with one click in the panel.
Is Caelum Refabricated compatible with fabric?
Caelum Refabricated officially supports fabric for Minecraft 1.20.1. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with Caelum Refabricated – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Caelum Refabricated consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
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Rent Modded Server
Install Caelum Refabricated with just one click on your server.