Rainbows are actually circles, but we usually only see an arc due to Earth’s horizon. To see a full-circle rainbow, the sun must be low and you may need to climb a mountain or board a plane. Earth is the only planet with rainbows and red rainbows occur when the sun is low. The longest-lasting rainbow was seen for nine hours in Taiwan in 2017.
Everyone wants to get rich quick, but if that’s your dream, forget about finding a pot of gold at the end of a rainbow, because…there’s no end. A rainbow is actually a circle, not an arc; we usually don’t get to see it all. Earth’s horizon blocks the lower half of weather magic from normal view. But all is not lost. If both you and the sun are in the right place, you might catch a glimpse of a full-circle rainbow, or at least most of it. To begin with, the sun must be low in the sky. The lower it is, the higher the peak of the rainbow will be and the more you will see. And if you can climb to the top of a mountain – or maybe board a plane – you’ll see even more of the backdrop. Hopefully, you might just see the whole circle; the pot of gold, of course, will remain out of reach.
Color your world:
Earth is the only planet with rainbows, as no other planet has the necessary water on its surface or in its atmosphere to form one.
Rainbows that look all red can occur when the sun is low in the sky; the shorter wavelength colors blue and green are scattered throughout the atmosphere.
The longest-lasting rainbow on record was seen for nearly nine hours over northern Taiwan in 2017.
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