Describe the bug
The WorldProviderMaveth class overrides the renderSky() base method on server side. This results in Galacticraft trying to load the SkyProviderMaveth class which is client side only.

This causes a crash during start up:

java.lang.NoClassDefFoundError: zollerngalaxy/core/dimensions/skyproviders/SkyProviderMaveth

Additional context

The WorldProviderMaveth needs to set the following method to client only:

It looks like it's missing the @SideOnly(Side.CLIENT) decorator.

	@Override
	@SideOnly(Side.CLIENT)
	protected void renderSky() {
		this.setSkyRenderer(new SkyProviderMaveth(this));
	}

WorldProviderMaveth also needs the @SideOnly(Side.CLIENT) decorator added to getFogColor() as getStarBrightness() is client only:

	@Override
	@SideOnly(Side.CLIENT)
	public Vector3 getFogColor() {
		float f = 1.2F - this.getStarBrightness(1.0F);
		return new Vector3(1F / 255F * f, 1F / 255F * f, 24F / 255F * f);
	}

Server starts now. Thanks.

Whoops, forgot to put that, thanks. Appreciate the detail you put in as well. Will get this fixed and uploaded soon.

https://www.curseforge.com/minecraft/mc-mods/zollern-galaxy/files/3680055

Should be good now. Check latest release. If not, I'll take another look tomorrow, but I'm confident this will work.