<P> Rainbows can be observed whenever there are water drops in the air and sunlight shining from behind the observer at a low altitude angle . Because of this , rainbows are usually seen in the western sky during the morning and in the eastern sky during the early evening . The most spectacular rainbow displays happen when half the sky is still dark with raining clouds and the observer is at a spot with clear sky in the direction of the sun . The result is a luminous rainbow that contrasts with the darkened background . During such good visibility conditions , the larger but fainter secondary rainbow is often visible . It appears about 10 ° outside of the primary rainbow , with inverse order of colours . </P>
<P> Rainbows can be observed whenever there are water drops in the air and sunlight shining from behind the observer at a low altitude angle . Because of this , rainbows are usually seen in the western sky during the morning and in the eastern sky during the early evening . The most spectacular rainbow displays happen when half the sky is still dark with raining clouds and the observer is at a spot with clear sky in the direction of the sun . The result is a luminous rainbow that contrasts with the darkened background . During such good visibility conditions , the larger but fainter secondary rainbow is often visible . It appears about 10 ° outside of the primary rainbow , with inverse order of colours . </P>
when does a rainbow appear in the sky
when does a rainbow appear in the sky
whenever there are water drops in the air and sunlight shining from behind the observer at a low altitude angle
whenever there are water drops in the air and sunlight shining from behind the observer at a low altitude angle