Two views of a 22-degree circular #halo around the sun that I saw on a walk this afternoon.
Halos are a lot more common than I used to think. Then I started actually looking for them. Even on a warm day like today, there can still be ice crystals higher in the atmosphere of the right size and shape to cause a display like this (or even more complicated ones).
@AskChip I can totally imagine that changes in atmospheric composition and temperature could impact the frequency of the right types of ice crystals forming.
I also seem to recall reading that noctilucent clouds we're either increasing in frequency or starting to appear at lower latitudes over the last decade or so.
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