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On August 3, a rare full circle rainbow appeared above the mountains in Shenzhen, South China’s Guangdong Province.
When sunlight and raindrops combine to make a rainbow, they can make a whole circle of light in the sky. However, it is a rare sight because sky conditions have to be just right, and even if they are, the bottom part of a full-circle rainbow is usually blocked by the horizon. That’s why we usually see rainbows not as circles, but as arcs across the sky.
(Compiled by Sun Shulang)
