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James Spann @spann on x 570.8K followers
Created: 2025-07-17 14:13:13 UTC
Did you know a rainbow is a full circle?
A rainbow is formed when sunlight is refracted (bent), reflected inside raindrops, and then refracted again as it exits. This process sends light out at a specific angle — about 42° from the direction opposite the sun — forming a cone of light. If you trace all those angles around your shadow, they form a complete circle.
From the ground, the horizon cuts off the bottom half of the circle, so we usually see just a semicircular arc. You can see the entire circle if you’re high up — in an airplane, on a tall mountain, or looking down from a cliff.
Here is a view from an airplane over NE Mississippi last night from David Null
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