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Full circle rainbow A rainbow is a circle of angular radius 42
degrees, centered on the antisolar point but we don't see a full circle because the earth
gets in the way. The lower the sun is to the horizon, the more of the circle we see—right
at sunset, a full semicircle of the rainbow with the top of the arch 42 degrees above
the horizon is visable. The higher the sun is in the sky, the smaller is the arch of
the rainbow above the horizon. To see a full circle rainbow one need be able to look down
on it with the sun behind you, only possible from an aircraft... i don't think