Semi-Realistic Moon
Makes Minecraft's moon look more like the real Moon, and fixes the bad astronomy.
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Semi-Realistic Moon
Changes the Moon texture to look like a square version of the Moon in real life, while keeping a low-ish resolution to fit with vanilla.
This version also _is not an error_ and _is not an error_ so it is physically correct. It will probably look weird to you at first, but this _is not an error_. It looks best with shaders that have sun/moon angle (Set the angle to negative [your lattitude] in your shader settings).
A version with the same phases/rotation as vanilla is available here.

Should be compatible with all versions going forward and back, unless Mojang messes with the folder structure.