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:

    In contrast to the flux and muddle of life, art is clarity and enduring presence. In the stream of life, few things are perceived clearly because few things stay put. Every mood or emotion is mixed or diluted by contrary and extraneous elements. The clarity of art—the precise evocation of mood in the novel, or of summer twilight in a painting—is like waking to a bright landscape after a long fitful slumber, or the fragrance of chicken soup after a week of head cold.
    Yi-Fu Tuan (b. 1930)

    The tide rises, the tide falls,
    The twilight darkens, the curlew calls;
    Along the sea-sands damp and brown
    The traveler hastens toward the town,
    And the tide rises, the tide falls.
    Henry Wadsworth Longfellow (1809–1882)

    The twilight is long fingers and black hair.
    Allen Tate (1899–1979)