22° Halo

No, it's not a moonbow as I originally thought but a moon ring otherwise known as a 22° halo:
A 22° halo is an atmospheric optical phenomenon that consists of a halo with an apparent radius of approximately 22° around the Sun or Moon. When visible around the Moon, it is also known as a moon ring or winter halo. It forms as sunlight or moonlight is refracted by millions of hexagonal ice crystals suspended in the atmosphere. Its radius is roughly the length of an outstretched hand at arm's length.
Cheers Wikipedia
22° moon halo

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