Double rainbow

Sometimes, you might observe a weaker rainbow on the outside of the primary arc. Known as a secondary rainbow, this arc is the result of light having been subjected to extra reflection inside the water drops before reaching our eyes. The secondary rainbow can be observed about 9 degrees above the primary arc (i.e. 51 degrees from the position of the sun). Its colour sequence is inverted, and its colours are not as clear as those of the primary rainbow. In rare cases, there will also be a third rainbow, in which the colours have once again been inverted.