Party Science 1: Parhelia

The only kind of dogs we have at South Pole

The only kind of dogs we have at South Pole


Without looking it up, why do you think that Sun Dogs appear on the left and right of the sun? There is sometimes a halo, and to me radial symmetry seems natural; so what’s special about the right and left that would account for parhelia?

Feel free to discuss in comments, but one rule: No looking up. And if you really really know, feel free to sit back and watch the guessing.

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6 responses to “Party Science 1: Parhelia

  1. I think the “left and right” can actually be connected in a arc that goes around the whole “dome” of the sky, and the dogs are at the intersection of that arc and the 22degree circle arc. Gradient of atmosphere thickness relative to the observer per yduJ above, makes sense, but sundogs occur at many elevations in the sky so the thickness changes.

    So i dunno, but i’m off to the http://www.atoptics.co.uk/index.htm site to refresh my memory.

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