Rainbows...?

Question

Rainbows are usually seen as arcs of a full circle. It is possible to see a full circle rainbow. If you do see a full circle rainbow, there will a shadow in the center of the circle. What is this the shadow of?

Answer 1

its not possible... light arcs... but u can never see the full circle... shadow is the sun or your imagination just like rainbows since when u run up to touch one you don't see it anymore...

Answer 2

You could see a full circle rainbow, if you are high enough.  I have occasionally seen them from planes when flying above a cloud deck .