Rainbows Have No Ends

All rainbows are, in theory, circles. You don’t see them as such because the Earth gets in the way! But pilots have noticed full-circle rainbows outside their plane windows, proving that if you get high enough, you can see a rainbow in its entirety. If you’re stuck on the ground, however, you can see the largest percentage of a rainbow (around 50% of the circle) by spotting one around sunrise or sunset. You can also create a full-circle rainbow yourself if you spray mist from a hose with your back to the sun.