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May 28, 2020 at 16:41 comment added jamesqf Yes, cloud iridescence, which is actually quite common. The only unusual part here is that the dark cloud blocks the direct sun, allowing it to be easily visible - and photographable! You usually need to be wearing sunglasses to see it (at least in my experience), since the light from the center of the cloud is so intense that it washes out the colors around the edges.
May 28, 2020 at 13:51 comment added David Hammen It's certainly not a sun dog, which appear 22° away from the Sun but at the same elevation as the Sun. The crepuscular rays indicate that the Sun is below and to the left of the strangely lit cloud.And I don't think it's cloud iridescence, either, as the picture was taken from southern India.
May 28, 2020 at 10:25 history answered Fred CC BY-SA 4.0