Ed Wiebe@thomasfuchs That is an excellent lunar halo. The 22º halo (as shown) and sun dogs are different phenomena. The halo is caused by hexagonal but elongated crystals (like a pencil) but the sun dogs, associated with the parhelic circle, are caused by hexagonal plates. The dogs only line up with a 22º halo when the sun (or moon) is near the horizon. Otherwise they are farther from the sun.
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