Moon Rainbow
dark night sky and bright moon light often give rise to a phenomenon called "lunar rainbow" - a rainbow appearing in the light of the moon. These rainbows are located on the opposite side of the moon from the sky and often seem to be completely white. However, sometimes they can be seen in all its glory.
Rainbows can take many forms, common to them is the right arrangement of flowers - in the sequence of the spectrum (red, orange, yellow, green, blue, indigo, violet). Rainbows can be seen when the sun illuminates part of the sky and the air is filled with droplets of moisture, such as during or immediately after rain. In ancient times, appearances by the rainbow in the sky gave a mystical sense. See a rainbow was considered a good omen, drive or go under it promised happiness and success. Double rainbow, as they say, brings good luck and wishes. The ancient Greeks believed that the rainbow - is a bridge to heaven, and the Irish felt that, at the other end of the rainbow is the legendary gold leprechauns.
Okologorizontalnaya arc
known as a "fire rainbow".
created in the sky when light is refracted through ice crystals in cirrus clouds. This phenomenon is very rare because the ice and crystals and the sun should stand exactly on a horizontal line, so there is a spectacular refraction.
This is particularly successful example was embodied in the skies over Spokane in Washington in 2006. 
Source: http://hostel.nstu.ru/viewtopic.php?id=156319 
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