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Kunstformen der Natur (1904) by Ernst Haeckel
Kunstformen der Natur (1904) by Ernst Haeckel

Twilight is the time before sunrise, or after sunset, when sunlight scattered in the upper atmosphere illuminates the lower atmosphere, and the surface of the Earth is between light and dark. Often confused with dusk, twilight is specifically defined as the period either side of night-time during which it is possible to conduct outdoor activities without the aid of artificial light. Due to the unusual, romantic quality of the ambient light at this time, twilight has long been popular with photographers and painters, who refer to it as the "blue hour", after the French expression l'heure bleue.

The collateral adjective of "twilight" is crepuscular (for daylight it is "diurnal" and for night, "nocturnal"). The term is most frequently encountered when applied to certain species of insects and mammals that are most active during that time.

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Unless indicated otherwise, the text in this article is either based on Wikipedia article "Twilight" or another language Wikipedia page thereof used under the terms of the GNU Free Documentation License; or on original research by Jahsonic and friends. See Art and Popular Culture's copyright notice.

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