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Rainbows are formed by refraction and reflection of light from the sun and moon by water drops. These water drops can be from fog, ocean spray, rain, waterfalls and a number of other sources.
A rainbow take many forms including single bow, double bow, cloud bow, dew bow, fog bow, geyser bow, moon bow, red bow, reflection bow, sky bow, spoked bow, supernumerary, twinned bow, waterfall bow, wave bow, whale spout bow and more.
When to see Rainbows
Rainbows are best seen when there is falling rain and sunlight at the same time. Early morning and late afternoon are the best times to see them because the sun must not be too high. Rainbows are always opposite the sun and their centers are below the horizon. The lower the sun is in the sky, the higher the rainbow will be.
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