Beautiful horizon rainbow in Paris  MAR 27 2013

Paris even does rainbows better than the rest of the world. This is a photo of a horizon rainbow taken over the Parisian skyline last week by Bertrand Kulik.

Paris Rainbow

What the heck is going on there? Astronomy Picture of the Day explains:

Why is this horizon so colorful? Because, opposite the Sun, it is raining. What is pictured above is actually just a common rainbow. It's uncommon appearance is caused by the Sun being unusually high in the sky during the rainbow's creation. Since every rainbow's center must be exactly opposite the Sun, a high Sun reflecting off of a distant rain will produce a low rainbow where only the very top is visible -- because the rest of the rainbow is below the horizon.

(via @DavidGrann)

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