The phenomenon is only visible during the cold weather.
People in the midlands were both amazed and baffled to see a ring around the moon at the weekend.
They weren't seeing things - a 'lunar halo' is an optical illusion caused by the refraction of moonlight from ice crystals in the upper atmosphere.
Seanie Morris of the Midlands Astronomy Club, says the phenomenon is only visible during cold weather:
Colin Farrell Rumoured To Be Part Of Star Filled Production In Offaly
Offaly Athletics Club Pushing To Raise €400k For New Olympic Sized Track
Offaly Community Hopeful Of Town Hall Reopening By 2030
Hospital Parking Charges Rise By Over €10m
Road Haulage Association Calls For Fuel Support Extension
Plans Submitted For New Off-Licence And Pizzeria In Laois
M6 Crash In Westmeath Causing Major Delays
Offaly Community Campaigning For Waterway Intervention