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Ice crystals in the upper atmosphere, were refracting the mid-day sunlight like a prism, creating this rainbow effect.
Some day I'd like to capture one of these "Sun Dogs" in a painting. I've seen them appear at night around a full moon. I wonder if they call these, "Moon Dogs".
My understanding is it's nature's way of warning us, in a strange way, to pay attention to what lies ahead. Coming events cast their shadows...and it looks like rain!