https://www.msn.com/en-us/weather/topstories/rainbow-rings-are-appearing-in-the-sky-all-over-the-world-and-no-one-knows-why/ar-AA11uxdu?ocid=msedgntp&cvid=e17542ad2c404260b318ae9aa6a8e818#comments I've snapped shots of them going back to around 2010. Always after a day or so of heavy spraying.