Small fragment of a #CircumhorizonArc from #Oxfordshire, UK on Friday 23rd June '23. The Sun has to be higher than 58 degrees for these to form so we don't get many opportunities from the UK. I sat outside for the entire 90mins the Sun was high enough hoping to catch this. The heat was brutal, but I'm so happy even to have caught a fragment! It's only the 2nd time I've photographed one from the UK. #AtmosphericOptics #OpticalEffects