The weather forecast
Ooh Aah my lovelies. Last night there was the clearest sky you can imagine with the most amazing ring around the moon - us old country folk always says that means the weather is about to change and it is time to cockle your stooks and whipple the heifers, and some even go on to claim that the ring that appears around the moon arises from light passing through six-sided ice crystals high in the atmosphere. These ice crystals refract, or bend, light in the same manner that a camera lens bends light. The ring has a diameter of 22° , and sometimes, if you are lucky, it is also possible to detect a second ring, 44° diameter. Thin high cirrus clouds lofting at 20,000 feet or more contain tiny ice crystals that originate from the freezing of super cooled water droplets. These crystals behave like jewels refracting and reflecting in different directions.
Amazing - wish I could have captured it on film.