0
$\begingroup$

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 ?

$\endgroup$
  • 4
    $\begingroup$ 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
2
$\begingroup$

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.

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.