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The sky appears blue to the human eye as the short waves of blue light are scattered more than the other colours in the spectrum, making the blue light more visible.
A circumzenithal arc is an optical effect which looks like an upside-down rainbow.
To be able to see a full circle rainbow you need to be able to see water droplets below your observable horizon - if you are standing on top of a tall building or looking out of an aircraft then you may have water droplets and sun
Advice for staying safe and well in hot weather
Please note that when changing units, only forecasts and maps will be affected.