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On the evening of December 3, there was a thick layer of clouds in the western sky. Suddenly, the setting sun broke through the clouds, and at the same time, a bright rainbow appeared in the eastern sky! I was surprised to find that the end of the rainbow was right on my doorstep. So close to me, less than a hundred meters away! At that time, the elevation angle of the sun was only about 2 degrees, and because I looked down from a relatively high floor, the rainbow already felt like it was about to become a circle.