Did anyone see this rare full circle rainbow over Milton Keynes?
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The rare phenomenon was snapped by reader Ken Pumford.
Ken added: "I'm 50 and I've never seen one before. I wonder who else saw it."
The sky was grey inside the circle and bright blue outside, he said.
A full circle rainbow is called a 'glory'.
Sky conditions have to be just right for it to happen and and even if they are, the bottom part of a full-circle rainbow is usually blocked by the horizon.
NASA defines a glory an optical phenomenon that "looks like small, circular rainbows of interlocking colors."