What does around the sun or moon indicate a rain or snow real soon?

The phrase "around the sun or moon" refers to the appearance of halos, which are optical phenomena caused by ice crystals in the atmosphere. When these halos are visible, they often indicate that moisture is present, suggesting that rain or snow may be on the way. This is because the ice crystals can signal an approaching weather system that brings precipitation. Thus, seeing a halo can be a sign of impending wet weather.