Cyanometer

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free-parking:cyanometer, c. 1789, an instrument that measures the blueness of a sky

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wasbella102:Cyanometer, c. 1789. An instrument that measures the blueness of a sky.

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zooophagous:nudityandnerdery:free-parking:cyanometer, c. 1789, an instrument that measures the bluen

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53 Shades of BlueThe question asked by Horace-Benedict de Saussure was not why the sky was blue, but

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53 Shades of BlueThe question asked by Horace-Benedict de Saussure was not why the sky was blue, but

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“Where is my cyanometer,” Thoreau exclaimed in his journal on a blue-skied spring day, referring to

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