A Horizon Rainbow in Paris
Although the rainbow which appears above Paris in this image looks rather unusual, it is actually just as ordinary rainbow. The Sun is very high in the sky at the time of this photo, causing it to appear horizontal to the ground. According to the physics laws governing the creation of rainbows, the center of a rainbow must be exactly opposite the sun. A rainbow is created by the light reflecting off of water drops in the atmosphere. "Primary Rainbows show red towards the outside and violet on the inside towards the ground. Secondary rainbows appear just the opposite. This image depicts a primary rainbow. The reason this rainbow appears flat is that only the upper portion of the arc is visible. The usual "sides" of the rainbow are below the horizon in this case. This feature was only visible from a certain angle and lasted a few minutes.
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