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  2. Twilight - Wikipedia

    en.wikipedia.org/wiki/Twilight

    Although civil dawn marks the time of the first appearance of civil twilight before sunrise, and civil dusk marks the time of the first disappearance of civil twilight after sunset, civil twilight statutes typically denote a fixed period after sunset or before sunrise (most commonly 20–30 minutes) rather than how many degrees the Sun is below ...

  3. Zodiacal light - Wikipedia

    en.wikipedia.org/wiki/Zodiacal_light

    Zodiacal light seen behind the Submillimeter Array from the summit of Mauna Kea. In the mid-latitudes, the zodiacal light is best observed in the western sky in the spring after the evening twilight has completely disappeared, or in the eastern sky in the autumn just before the morning twilight appears.

  4. Sky brightness - Wikipedia

    en.wikipedia.org/wiki/Sky_brightness

    Twilight (both dusk and dawn) is divided into three 6° segments that mark the Sun's position below the horizon. At civil twilight , the center of the Sun's disk appears to be between 1/4° and 6° below the horizon.

  5. Crepuscular rays - Wikipedia

    en.wikipedia.org/wiki/Crepuscular_rays

    Crepuscular rays usually appear orange because the path through the atmosphere at dawn and dusk passes through up to 40 times as much air as rays from a high Sun at noon. Particles in the air scatter short- wavelength light (blue and green) through Rayleigh scattering much more strongly than longer-wavelength yellow and red light.

  6. Dusk - Wikipedia

    en.wikipedia.org/wiki/Dusk

    The time of dusk is the moment at the very end of astronomical twilight, just before the minimum brightness of the night sky sets in, or may be thought of as the darkest part of evening twilight. [4] However, technically, the three stages of dusk are as follows: At civil dusk, the center of the Sun's disc goes 6° below the horizon in the ...

  7. Blue hour - Wikipedia

    en.wikipedia.org/wiki/Blue_hour

    Blue hour at the Old Cathedral of the Holy Name of Jesus, Bragança in Portugal. The blue hour (from French l'heure bleue; [1] [a] pronounced [lœʁ blø]) is the period of twilight (in the morning or evening, around the nautical stage) when the Sun is at a significant depth below the horizon.

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