Rainbows are scientific phenomena which can be accurately predicted. A rainbow occurs when sunlight passes through a fine spray, such as at the base of a waterfall, and is refracted into its component colors - red, orange, yellow, green, blue, indigo and violet.
You can see rainbows in Yosemite at the base of Vernal Fall and Bridalveil Fall in the late afternoon, when you're standing directly between the fall and the sun. A circular halo will form with a 42 degree radius, around a point exactly opposite the sun.
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