I might be stupid by not knowing this, but I suddenly got an item on my bucket list.

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I don't think there is a limit, it's just that each one is significantly less visible. It's all to do with the number of bounces within the rain drop.

IIRC rings 1 and 4 are towards the sun.

In cold climates you can also get sun halos where the position depends on the shape of the ice crystals in the air.

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