The cyanometer (from cyan and -meter) is an instrument for measuring 'blueness', specifically the colour intensity of blue sky. It is attributed to Horace-Benedict de Saussure and Alexander von Humboldt. It consists of squares of paper dyed in graduated shades of blue and arranged in a color circle or square that can be held up and compared to the color of the sky.
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If you're feeling crafty you can make your own cyanometer. Instructions here.
Not feeling crafty? Just take a photo of the sky and there's an app that defines the colour.
Thanks Bruce!
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