To get all this pack has to offer you need to patch your game with MCPatcher or mod it with Optifine.
If you don't, only the sun and moon will change but you won't see clouds and other effects.
In order to use it, put the pack in your /resourcepacks folder, start the game, go to the resource packs menu and move PR Atmosphere on top of all other packs you're using (if any).
NOTE: you need to set the render distance at 8 or higher, otherwise Optifine won't show the sky boxes. I also suggest to disable the clouds so those ugly white blocks don't get in the way.
This sky effects were originally made for my Pixel Reality resource pack and are now included in this standalone pack so you can use it with vanilla textures or other packs instead of PR. This pack just does that, all other textures are untouched.
Basically this pack adds realistic sun, moon, clouds and sky to any pack of your choice and it's high resolution enough to work with low res and HD packs as well.
Sorry, there was no "plain link" :I
-There is now...
Didn't you see the "Alternative download link" just above the donation button? Sorry to insist but I need to know because I put that link in case the widget doesn't work, and if the link is also invisible I have to fix it.