A solar halo is a very interesting optical phenomenon that’s caused by the Suns light interacting with ice crystals in very high cirrus type clouds. You can also see the same phenomenon when you have a full Moon in the night-time sky. Another interesting fact is this ring around the Sun or Moon is exactly 22 degrees!
You can find out more about the science of solar and lunar halos at:
My image was taken on Sunday the 28th March 2021 with a Canon G7X camera Mark 11 camera; the exposure time was 1/400th second with ISO200 using manual focus.