Lunar Halos at Krakow, Poland by Bogdan Kossewski Image ©Bogdan Kossewski, shown with permission.
The moon was full and 21° high. A bright moon and an otherwise dark sky are needed to see lunar halos. The large image is a rare lunar circumzenithal arc generated by horizontal plate crystals in high cirrus. The insets show 'moon dogs', paraselenae, and above the moon an upper tangent arc. Lunar halos, like lunar rainbows, have less colour visually because they are usually hardly bright enough to excite the colour sensors in our eyes.
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