The measurement or determination of the degree of blueness in the sky or cyan color intensity in light.
From cyano- (Greek kyanos 'dark blue') + -metry (Greek -metria 'measurement'). This 18th-century term emerged during the Scientific Revolution when naturalists systematically quantified atmospheric phenomena.
Cyanometry was serious science in the 1700s—scientists would carry cyanometers up mountains to measure how sky color changed with altitude, and their data helped develop our modern understanding of atmospheric light scattering.
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