Twilight is the time between dawn and sunrise or between sunset and dusk, during which sunlight scattering in the upper atmosphere illuminates the lower atmosphere, and the surface of the earth is neither completely lit nor completely dark. The sun itself is not directly visible because it is below the horizon. Owing to the distinctive quality of the ambient light at this time, twilight has long been popular with photographers, who refer to it as Sweet Light, and painters, who refer to it as the "blue hour", after the French expression l'heure bleue.

The collateral adjective for twilight is crepuscular; it is most frequently encountered when applied to certain insects, fishes, and mammals that are most active during that time.

Read more about Twilight:  Definitions, Length, On Other Planets, In Hinduism, Gallery

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Famous quotes containing the word twilight:

    I’ve been in the twilight of my career longer than most people have had their career.
    Martina Navratilova (b. 1956)

    The eastern light our spires touch at morning,
    The light that slants upon our western doors at evening,
    The twilight over stagnant pools at batflight,
    Moon light and star light, owl and moth light,
    Glow-worm glowlight on a grassblade.
    O Light Invisible, we worship Thee!
    —T.S. (Thomas Stearns)

    It is possible to believe that all the past is but the beginning of a beginning, and that all that is and has been is but the twilight of the dawn. It is possible to believe that all the human mind has ever accomplished is but the dream before the awakening.
    —H.G. (Herbert George)