....Straight rainbows can be seen standing like a pillar over a large body of water, usually next to the end of a curved rainbow!

....When the sun and atmosphere are just right, the reflections from the surface of the water creates many rainbows on top of each other. From a particular point, only the ends of these rainbows are visible, resulting a "composite" rainbow that sticks straight up into the sky.

....Other special rainbows are visible at certain times. A purple rainbow is a rare occurrence before sunrise, created by high clouds that scatter blue and violet light into raindrops, creating a purely purple rainbow. ....Striking red rainbows can sometimes be observed just before sunset, when the shorter wavelengths of light (blue, green, yellow) have been dispersed by their relatively long trip through the atmosphere.
....White rainbows may sometimes be observed when the sunlight is reflected from very small droplets of moisture - so small that the bands of color overlap, creating a white rainbow arc.

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