Okay, there are two scenarios here:
1. The sun is at 150million km far and the picture was taken from the height of the clouds, or... and this is the more likely...listen:
2. The sun is at the same heights as the clouds, that means you can easily fly above the sun with a regular commercial plane, that means you can literally jump into the Sun without any problem.
Tight!
Go out to Kansas, or some other place that is reasonably flat. Get up early in the morning, before the sun comes up. Get your cup of coffee, and go out and sit in your lawn chair, facing east. Set your coffee down for a moment, and rub the sleep out of your eyes. Then (with or without your coffee) watch for the sun.
Here it comes. It looks like it is traveling up over from the horizon. Gradually it moves into the sky.
I think there is a joker with a big spotlight, who shines it on the dome every morning. And all we see is the reflection of the spotlight off the dome.
But it could be perspective, and light doesn't really travel in a straight line. The sun is really up there, and some strange electromagnetic effects curve light, and make the sun look like it is below the horizon, gradually moving up.
I am really glad that I live where I live. 'Cause I have watched the sun go down and dip beneath the horizon... so to speak. I wonder how many lives got snuffed out where the sun landed back there. I SURE AM GLAD THAT i LIVE WHERE I LIVE, AND NOT AT THE HORIZON.