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Astrophysics: Addon for Astrocraft

by PixelFlux

Astrophysics: Addon for Astrocraft adds spacetime and orbital effects to the Astrocraft simulation, from lunar phase timing to a tuned solar glare, for Fabric and Quilt.

FabricQuiltClient and serverMIT License1.20.1 – 1.21.4

What it does

Astrophysics works only together with Astrocraft, the astrophysical spacetime simulation it extends, and it requires Cloth Config API and Fabric API as well. Installing the addon on the client and on the server is required, since the environment is client and server. Mod Menu is optional and only adds a config screen entry. Files cover 1.20.1, 1.21, 1.21.1 and 1.21.4, and the latest build for both Fabric and Quilt targets 1.21.4.

The addon replaces the vanilla solar asset with a glare model based on real atmospheric optics and overhauls the lunar texture so the phases follow orbital mechanics. Its lunar cycle duration has to match the value set in Astrocraft, otherwise the two mods fall out of sync. Sodium users can turn off Zodiacal Light in the config to avoid lighting artifacts, and shader compatibility has not been tested by the author.

The license is the MIT License, and the project is not open source in the usual sense of a public repository release listing.

Key features

  1. Lunar phase synchronization

    The lunar cycle follows the duration set in Astrocraft, keeping moon phases aligned with the simulation.

  2. Rotational centrifugal force

    Outward inertia from Earth's rotation partly offsets gravity near the equator, as the simulation models it.

  3. Gradual rotational slowing

    Tidal friction and gravitational drag slow the planet's spin over time within the Earth-Moon system.

  4. Photorealistic solar glare

    The default sun sprite is replaced by a glare model built on real atmospheric scattering principles.

  5. Accurate lunar texture

    A rebuilt moon texture shows phases based on the exact orbital geometry used in the simulation.

Compatibility

Latest build for each game version and loader.

1.21.41.01.0
1.21.11.01.0
1.211.01.0
1.20.11.01.0
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

Requirements

Dependencies declared by the latest file for each loader.

Required 3

Fabric APILightweight and modular API providing common hooks and intercompatibility measures utilized by mods using the Fabric toolchain.
Required
AstrocraftA Customizable and Realistic Astronomy mod. Adds real life stars, planets, meteors and, an orbiting moon with eclipses.
Required
Cloth Config APIConfiguration Library for Minecraft Mods
Required

Optional 1

Mod MenuAdds a mod menu to view the list of mods you have installed.
Optional

Questions

Does Astrophysics need Astrocraft to run?

Yes. Astrocraft is a required dependency, and Astrophysics only adds effects to its simulation.

Must the lunar cycle setting match Astrocraft?

Yes. The lunar cycle duration in this addon has to equal the value set in Astrocraft, or the two will desynchronize.

Does Astrophysics work with shaders?

The author has not tested shader compatibility, so results with shader packs are unknown.

In the catalog

Astrophysics: Addon for Astrocraft is one of 12,078 Decoration mods on ModsFinder, and one of 6,982 Decoration mods for Fabric. 17,979 mods support Minecraft 1.21.4.

Decoration mods12,078Fabric modsMods for 1.21.417,979

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Official listing

Owner
PixelFlux
Published
2026-08-07
Updated on Modrinth
2026-09-18
Facts verified
2026-10-15

Tags

DecorationGame mechanicsUtilityAdventure
Open on ModrinthCompare