Trethevy Quoit 11
Image by Moth

StoneGloves wrote:
What they're seeing is lens flare. Part of the eye is a lens, after all.
Good call. That, but converted to a retained image perhaps.
What is NOT possible to see IMO is the corona or "boiling", whatever the qualities of the hole.

When I had younger eyes and they were more frequent and bigger I often saw sunspots at sunset. Haven't seen them lately though.

There's a good picture on here ( http://www.spaceweather.com/ ) today. Thom writes about the green flash, but I've never seen it.