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Possible Answers:
Sky.
Last seen on: Daily Celebrity Crossword – 2/6/23 Movie Monday
Random information on the term ” Sky”:
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A cyanometer (from cyan and -meter) is an instrument for measuring “blueness”, specifically the colour intensity of blue sky. It is attributed to Horace-Bénédict 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.
De Saussure, a Swiss physicist and mountain climber, is credited with inventing the cyanometer in 1789. De Saussure’s cyanometer had 53 sections, numbered cards, ranging from white to varying shades of blue (dyed with Prussian blue) and then to black, arranged in a circle; he used the device to measure the color of the sky at Geneva, Chamonix, and Mont Blanc. De Saussure concluded, correctly, that the color of the sky was dependent on the amount of particles, water droplets and ice crystals, suspended in the atmosphere. Humboldt was also an eager user of the cyanometer on his voyages and explorations in South America.