Cubic Sun and Moon Wiki & Guide
wiki.9minecraft.net/cubic-sun-and-moon-9minecraft-resource-pack/
How the Cubic Sun and Moon resource pack turns Minecraft's flat sun and moon into 3D cubes in 26.2, with 8 cubic moon phases.
Overview
In vanilla Minecraft the sun and moon are simple flat squares painted onto the sky. Cubic Sun and Moon replaces them with chunky, three-dimensional cubes that match the game's blocky look.
The sun becomes a glowing cube during the day, and the moon becomes a cube that cycles through all eight lunar phases at night. Vanilla colours and lighting are kept, so sunrises, sunsets and moonlit nights still feel natural - only the shape of the sun and moon changes.