This is a tiny resource pack which only changes the texture of Sun and Moon. The applied textures round off the sharp corners of the pixely vanilla Sun & Moon.
This small resource pack works for many minecraft versions. Note that the resource pack format is currently set to 46 which corresponds to the 1.21.4 version of the game. In other versions it will be highlighted red with a text saying it's either for a newer or older version.
Have fun with this neat little pack :D