Surely all of you have seen him and even people who says an old legend of: if the moon is halo is tomorrow going to be cold.
The halo has the Moon, or a halo, it is a simple matter of temperature difference between different heights. The halo that looks are nothing more than ice crystals in the upper atmosphere that anyone who has studied optics, you can explain, a hexagonal crystal reflects light 22 degrees, creating that aura.
So it’s not that tomorrow will be cold, is that this cold in the upper cooling clouds and therefore the suspension water there is.
This same halo can be seen by day in the sun, but of course, do not see looking directly at the sun … or at least I hope for you not to remain blind.