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Celestial Order Fix Shaders for Minecraft 1.21.1, 1.21

Makes the Moon render in front of the Sun so that eclipses become possible via data packs. Optional Panini Projection toggle that is off by default.

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Updated 30.10.2026
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About Celestial Order Fix shaders

Built on Bestsoft100's Base Shader v3.0 so that it looks like Vanilla.

Overlays a square cut-out on the Sun when the Moon is overlapping it. Also culls stars near the Sun/Moon so that they don't appear in front. Originally intended as a companion shader for the Ardwick data pack, but works generally.

Celestial Order Fix — screenshot 3

CC0 licensed so please use this however you like.

Only works nicely for resource packs that have square Moons. ECLIPSE_BODY_HALFWIDTH controls the size of the cut-out, set to 2.85 for the Vanilla Moon size. See the Ardwick data pack's sun.png if you wish to shrink the Sun to be the same size as the Moon so that a full eclipse is possible (as the Vanilla resource pack ships a Moon that is smaller than the Sun).

Tested in 26.3 but its so light touch that it should work for 1.21+. If you want to check out eclipses try this shader with the Ardwick data pack and /time set 150000.

Other:

  • Added Panini Projection. Off by default, customisable in settings.
Celestial Order Fix — screenshot 4

How to install Celestial Order Fix

With Millida Launcher

  1. Install Millida Launcher

    The launcher is free: download it at millida.net/launcher and sign in with any nickname.

  2. Click “Install” on this page

    The launcher opens and installs the shaders for Minecraft 1.21–26.3 automatically.

  3. Launch the game

    A profile with it appears in the launcher: click “Play”.

Manually

  1. Install Iris or OptiFine

    Without a shader mod the game cannot see shaders. Install it for the same Minecraft version.

  2. Download the shader archive

    Pick the file Celestial-Order-Fix-v1.2.zip (26 KB) and do not unpack it.

  3. Put it in the shaderpacks folder

    “Options”, then “Video Settings”, then “Shader Packs”, then “Open Shader Pack Folder”, and drag the archive there.

  4. Select the shaders

    In the same window, click the pack name and “Apply”.

Versions

With dependencies

MinecraftLoaderFileDateActions
26.3Iris, OptiFine26.326.2 KB
26.3Iris, OptiFine26.326.1 KB
26.3Iris, OptiFine26.324.1 KB

FAQ

Which Minecraft versions does Celestial Order Fix work on?

There are files for 1.21–26.3, 17 versions in total. The newest is 26.3.

What do I need to run Celestial Order Fix?

Shaders are loaded through Iris or OptiFine: without one of them the game cannot see them.

Where can I download Celestial Order Fix safely?

On this page: the file Celestial-Order-Fix-v1.2.zip (26 KB) is stored on Millida’s server, with no link shorteners. SHA-1 checksum: 8917547e534102c5f621b86c7bd8130dbab6320c.

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Author: ArdwickLicense: CC0-1.0

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