Last friday I was on a first aid course in Köngäs and noticed on the snow surface a suspicious looking 22° degree halo. The lack of sharp inner edge reminded me of last winters snow surface odd radius displays.
So on a lunch break I went to a lake ice to photograph. There was only time for 79 shots, but that was enough to make 9° and also faint 24° halo appear. Given is also a mirrored version of the stack.