Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download Moons and Night Skydome Free.
Moons and Night Skydome v1.2
This package includes :
– One 3D moon (2048px seamless textures, PBR ready)
– Three 2D moons on planes : Full / Half / Quarter moons
– One night skydome
– All the shaders has been set up for night environment and ready to use.
– Be sure to place the moon at a large distance ( increase the far clip plane if needed ) And always face the center of the scene with the 2D moons.