the sun is brighter when it is close to you (overhead) and less bright when it is far from you. Gradient.

No it isn't. If that were true, you could comfortably look directly at the sun without damage to your eyes as it "faded in" in the morning and "faded out" at night.

Try to google "sun fade out". You will see the gradient of the last bits of ligjt as the sun fades, refracted by elements and particles

Right, all video from nasa, independent researchers, amd everyone who disagrees with you is fake, but google can be trusted... Bit selective, no?

What is really cool is the view when the sun fades away. Like vanishes. It can be seen easily from a high elevation on a clear day, and using a zoom lense.

I work on roofs for a living. No it doesn't.

You will notice the last color to be seen is green, but only for a few seconds. That is because the frequency of that color is higher and thus can pentrate deeper it to the air. And we see that green gadient pass in this fade out.

Why green? Why not a higher frequency like purple? And why would it be red (low frequency) at sunset as it starts to fade? Shouldn't red be the first frequency to be cut off by the "fading"? Or do you see something totally different in that case as well?