A large ring surrounds the sun in the sky accompanied by wispy clouds.

Mysteries of some atmospheric halos remain unexplained after 5,000 years

For the first time in almost 5,000 years of observations, researchers have fully cataloged optical illusions created in the sky as light shines through ice crystals known as atmospheric halos. 

The atmospheric halo ‘inventory’ details frequently seen atmospheric optical illusions from known sources as well as shedding light on rarer halos, including ones with origins that are currently a mystery. 

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