Share the Sky with Someone Far Away with These Cyanometer and Sunset Postcards
While exploring the Alpine region around Mont Blanc in 1789, the Swiss physicist and mountain climber Horace-Bénédict de Saussure (1740-1799) conceived of a tool to measure the blueness of the sky. He developed a round instrument dubbed a cyanometer with 53 shades dyed from Prussian blue he could hold up and compare to the atmosphere above. Saussure correctly predicted that the color correlated with the amount of water present, handy information for someone intending to scale a mountain. More
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