Multiple atmospheres at the same time

I may be finally getting the hang of Vulkan synchronization! Making the atmosphere shader/pipeline/subpass RMW (Read-Modify-Write) wasn't as hard as I thought :o)

Voice from 60s ads: Now you can enjoy the beautiful atmospheres of Mars and Earth at the same time!

Here's a Martian sunset (or sunrise, I'm not sure)

A sunset on Mars, from high above the ground. The dark Martian surface is taking up the right half of the picture, with a gradient from pale blue near the surface to orange, with a small dot of our Sun in the middle.