One day when I was playing basketball I saw a circle around the bright Sun. It is a perfect circle with a radius of about 20-30 km.

Why does this circle of light form? I have seen the same also around the moon. But this does not happen every day. Why ?

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    $\begingroup$ Radius of 20 - 30 km? What do you base that on? $\endgroup$ – adrianmcmenamin Sep 3 '17 at 17:01
  • $\begingroup$ I just imagine. $\endgroup$ – Mental Shakya Sep 4 '17 at 9:06

Most probable you have been experiencing a weather phenomena: Ice crystals in the sky reflect or bend the light to form a halo.

So, this depends on the temperatures and moisture content of the atmosphere and cannot be seen every day.

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