Explanation text
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Halo (Optical Phenomenon)
Halo is a optical phenomenon that looks like light circle around the sun and moon. Sometimes this happen in other light sources like street lamp.
Halo happens when sun light hit crystals ice that shaped like stick and prism. After that sun light split up in to the some color. That thing is reflected in a certain direction ( around the sun) and then become ring light around the sun.
Halo can happens anywhere, but it mostly happened in the area that have winter season. Halo is formed depends on shape and direction of crystals ice.
Halo can be form because of crystals ice in the cirrus cloud (mostly cirrostratus) that cold and in the height of 5-10 km or 3-6 miles in troposfer. this phenomenon depends on shape and crystals ice direction reflected and refracted by ice surface so that sun light can split up in to some colors. It happened because of air dispersion effect. And then it reflected to certain certain direction just like rainbows.

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