In order to see a rainbow it must by raining in some place and sunny in another, because of this aspect all rainbows will appear opposite of the sunshine. A rainbow is a phenomenon created when the Sun shines upon droplets of moisture in the sky. It takes the form of a colorful arc. The colors and forms of rainbows all depend on the weather, time of day, and the location of you.
For instance a "double rainbow" occurs a second reflection off of the first rainbow. The colors of the outside rainbow are the inverse, or opposite, of the inner rainbow. A double rainbow phenomenom is caused when light is refracted twice in each droplet. Light can be refracted three or even four times in a droplet, creating even more rainbows, though this is very rare.
Another rainbow phenomenon is a supernumerary rainbow. This rainbow consists of pastel colors on the inner rainbow, and very rarely secondary rainbow, placed in an unusual arrangement. There is no real geometric explation for this, but it is created by interference of other light rays.
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