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Two views of a 22-degree circular 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).

@sohkamyung Thank you!

Usually I just go for a utilitarian, "got a picture of the halo," but this time I tried about five different things to block the sun, trying to compose an interesting shot as well. I'm going to have to keep that up!

@kelsonv Definitely keep it up. The composition of the shots are really nice.

@kelsonv Not a lot of people actually look up, is what I suspect...

From over (OMG!) 40 years ago - during a class on history of science, in about 200 students, I was the only one who raised her hand when the prof asked if we had ever seen a "sun dog".

I'd seen my *first* one at least 15 years before that time - lots of family road trips meant I got to stare out the window a *lot*!

@kelsonv Have seen those halos quite a bit and I'm fairly certain they are more frequent than when I was much younger.

@kelsonv Increased CO2 and methane (CH4) in the atmosphere made sunsets more orangy as well since CO2 has a higher Index of refraction than Oxygen or Nitrogen. This I looked up after seeing a stunning sunset with much yellow and orange about 45 years ago.

@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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