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Most of us only ever see a fraction of a full rainbow: an arc. But optically, a full rainbow makes a complete circle. Physics explains why.
Curiosity - How can you glimpse a full-circle rainbow? Get up high
Rainbows are actually full circles - Woo
Here's why rainbows have a curved or arcing shape
If Rainbows Are Circular, Why Do We Only See Arches?
Rainbows are actually full circles. A physicist explains., by Ethan Siegel, Starts With A Bang!
91 Photography ideas photography, double exposure photography
FACT OR FICTION: A Full Rainbow Is Actually A Complete Circle, Weather Blog
How was it discovered that rainbows are full circles and not arcs? What is the backstory and any photos? - Quora
Can you ever arrive at the spot where a rainbow hits the ground and illuminates whatever is there? - Quora
Rainbows are actually full circles. A physicist explains - Big Think