Here's a bright sundog, a bright patch of light at the same altitude as the Sun, 22 degrees away from it. Results from refraction in hexagonal ice crystals https://old.atoptics.co.uk/halo/dogfm.htm #sundog #refraction #icecrystals #meteorologicaloptics #Perth

Rainbow over Big Sand, Gairloch. Notice the fainter secondary bow, produced when rays of light are reflected twice inside the water droplets. All the more beautiful when we see it with understanding #rainbow #bigsand #gairloch #meteorologicaloptics #westerross

Ice crystal halo around the Sun. Its radius is 22 degrees, a number that results from the hexagonal shape of the crystals and the refractive index of water ice #22degreehalo #icecrystalhalo #Sun #meteorologicaloptics #halo #physics