"Each rainbow you see is unique to you and centered on your eyes so all rainbows form a circle centered on a point marked by the shadow of your head (called the antisolar point). To see light from the top of a rainbow, you look up at an angle of 42 degrees. To see light from the sides of the arc, you look over 42 degrees. To see light from the bottom of the rainbow, you look down 42 degrees. Of course, if the ground is in the way, you won't see the bottom of the circular bow."
(found here)
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