How is the ring around Sun or Moon formed?

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The clear night skies are often mesmerizing. They have served as inspiration for many poets .The ring formed around it has its own story roo. The ring is the spectrum of seven colors.
Its called the halo.
These are caused by the cirrus clouds.( the clouds which are found at the highest altitude in the atmosphere, 20k feet abv).These clouds have millions of ice crystals so they split light by refraction and reflection. They are visible for both sun as well as the moon.
In olden days citing of halo  considered as harbinger of rain,from there itself ‘ring around the moon’ phrase was started meaning it is about to rain soon. Fun fact is that halo appear in clear sky but they are actually caused by clouds high above ( which are alomst invisible to us)..

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