Blender procedural sky environment

One shader allow get many various of sky surfaces & create transition between day & night, between sunny & rainy day.
https://www.blendermarket.com/products/sky-shader-v2-eevee
It can be useful for natural scenes or cartoon. You can get different types & results of sky surfaces, stars & weather mood transitions. Aslo you can create timelaps sky background.

Using Blender 2.8 & new rendering engine Eevee + this shader, you can in realtime see result of animation, Or using this for VR.