A rainbow is a multi-colored arc that forms in the sky caused by the refraction, light reflection and dispersion in water droplets. This fenomen happens when is raining in one part of the sky and in the other side it is sunny. If you see it from the ground we can only see a semi-circle, however if you are really high up you can see it in a complete circle. Different civilizations had different beliefs about rainbows in ancient times. According to Greek mythology, this incredible light fenomen is a bridge between heaven and earth.
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