Sky blue refers to a collection of shades comparable to that of a clear daytime sky. Typically it is a shade of cyan or light teal, though some iterations are closer to light blue. The term is attested from 1681. A 1585 translation of Nicolas de Nicolay's 1576 Les navigations, peregrinations et voyages faicts en la Turquie includes "the tulbant [turban] of the merchant must be skie coloured".
Bright blue sky with clouds
Pure Celeste between Spadafora and Torregrotta, Sicily in September; the color of the ideal sky is shown with a perfectly or near-perfectly weather, especially close to the horizon, where the cyan is more evident.
Pure Celeste between Spadafora and Torregrotta, Sicily, with a perfectly clear, serene and sunny weather in September. Note that the pure celeste is more evident close to the horizon, where the cyan is more intense.
Pure celeste at the horizon of Messina, Sicily, in February; in this part of the year, with a relatively low sun, the pure celeste is shown only at the horizon and around noon.
Cyan is the color between blue and green on the visible spectrum of light. It is evoked by light with a predominant wavelength between 500 and 520 nm, between the wavelengths of green and blue.
Image: Nympheas 71293 3
Image: American Robin Eggs in Nest
Image: Lidded Funerary Urn (Lunghu Ping) with Dog and Dragon LACMA 53.41.3a b (cropped)
Image: Uranus clouds
