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  2. Night aviation regulations in the United States - Wikipedia

    en.wikipedia.org/wiki/Night_aviation_regulations...

    Three different concepts of "night" are referred to in the Federal Aviation Regulations in the US. These include the periods from sunset to sunrise - used for nav lights,; the end of evening civil twilight to the beginning of morning civil twilight (this is the "standard definition of night", given in FAR Section 1.1) - used for logging night flight,

  3. Twilight - Wikipedia

    en.wikipedia.org/wiki/Twilight

    In the United States' military, the initialisms BMCT (begin morning civil twilight, i.e., civil dawn) and EECT (end evening civil twilight, i.e., civil dusk) are used to refer to the start of morning civil twilight and the end of evening civil twilight, respectively. Civil dawn is preceded by morning nautical twilight and civil dusk is followed ...

  4. Dusk - Wikipedia

    en.wikipedia.org/wiki/Dusk

    Civil, nautical, and astronomical twilight. [3] Dusk is the darkest part of evening twilight. 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]

  5. 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.

  6. Polar night - Wikipedia

    en.wikipedia.org/wiki/Polar_night

    For example, a typical day during civil polar twilight in Vadsø, Norway will begin with night, astronomical twilight, nautical twilight, and civil twilight in that order (with each successive phase including more light than the last). Following civil twilight, the day will progress through the other phases in the opposite order (nautical ...

  7. Lighting-up time - Wikipedia

    en.wikipedia.org/wiki/Lighting-up_time

    D. O'Leary, When to light up: a pocket treatise on the Lights on vehicles act, 1907 containing a full explanation of the act, with a table showing the lighting-up time Published 1908; D. A. Schreuder, J. Kosterman, Adriana Morris Road Lighting for Safety Published by Thomas Telford, 1998 ISBN 0-7277-2616-1 Page 231

  8. Civil twilight - Wikipedia

    en.wikipedia.org/?title=Civil_twilight&redirect=no

    This page was last edited on 17 February 2013, at 15:11 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

  9. Civil twilight (disambiguation) - Wikipedia

    en.wikipedia.org/wiki/Civil_twilight...

    Civil twilight is the brightest phase of twilight, the illumination of the lower atmosphere when the Sun itself is not directly visible because it is below the horizon. Civil twilight may also refer to: Civil Twilight (band), a South African four-piece rock band Civil Twilight, 2010

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