twilight

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The soft light in the sky seen before the rising and (especially) after the setting of the sun, occasioned by the illumination of the earth’s atmosphere by the direct rays of the sun and their reflection on the earth

• At twilight, snow looks blue.

  В сумерках снег кажется синим.

  Tatoeba · AlanF_US · CC BY 2.0 FR

• Twilight offers the best chance of seeing wild animals.

  Tatoeba · sundown · CC BY 2.0 FR

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The time when said light is visible; the period between daylight and darkness

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Any faint light through which something is seen

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The time when the sun is less than 18° below the horizonредкое

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An in-between or fading condition through which something is perceivedредкое