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Why do rainbows appear?

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Rainbows caused by sunlight always appear in the section of sky directly opposite the sun. Rainbows can be full circles. However, the observer normally sees only an arc formed by illuminated droplets above the ground, and centered on a line from the sun to the observer's eye. read more

Rainbows are actually a trick of geometry and not only happen after rainfall, but require a certain angle to be reached before they can appear. Rainbows are formed when sunlight goes into a raindrop, bounces out of it, and refracts into the 7 colors of visible light. read more

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