That is a sunset, as seen from where I spend most of my evenings, guarding a gate at an exclusive private community.
When I am not busy taking calls and letting cars in, I have two giant video monitor screens full of smaller screens, showing live video from multiple security cameras, that I am supposed to keep my eyes on. It was dark outside, I glanced up, and there was a giant ghost spider dancing on one of the small windows. Scared the snot out of me.
I should have expected it sooner or later. There are spider webs in a few of the video camera housings. But I didn’t expect it then.