Dream Chaser ⚡️🐆 on Nostr: The cyanometer is a 230-year-old tool for measuring the blueness of the sky. The ...
The cyanometer is a 230-year-old tool for measuring the blueness of the sky.
The simple device was invented in 1789 by Swiss physicist Horace-Bénédict de Saussure and German naturalist Alexander von Humboldt.
Published at
2025-02-03 12:32:02Event JSON
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