In Hawaii you can see rainbows every day, but they are much rarer in Shizuoka. So when a giant double rainbow crossed the sunny sky yesterday it was a sight enjoyed by many people. Even NHK showed pictures in the evening news.
In his comment to Quick Quiz XXV dragonlife replied with another quiz, an excellent question: what does a rainbow look like when seen from above, for example from an airplane.
I admit that I didn’t know, so I did some research and found this photo taken from an airplane above the clouds.
Maybe you can just see a circular rainbow on the clouds. This is a very unusual sight. I hope this is the right answer dragonlife!