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  2. Twilight - Wikipedia

    en.wikipedia.org/wiki/Twilight

    Twilight occurs according to the solar elevation angle θ s, which is the position of the geometric center of the Sun relative to the horizon. There are three established and widely accepted subcategories of twilight: civil twilight (nearest the horizon), nautical twilight, and astronomical twilight (farthest from the horizon).

  3. 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. At nautical twilight, the Sun's altitude is between –6° and –12°. At astronomical twilight, the Sun is between –12° and ...

  4. Dawn - Wikipedia

    en.wikipedia.org/wiki/Dawn

    The period of twilight is shortest at the Equator, where the equinox Sun rises due east and sets due west, at a right angle to the horizon. Each stage of twilight (civil, nautical, and astronomical) lasts only 24 minutes. From anywhere on Earth, the twilight period is shortest around the equinoxes and longest on the solstices. [citation needed]

  5. Polar night - Wikipedia

    en.wikipedia.org/wiki/Polar_night

    Civil" twilight occurs when the Sun is between 0 and 6 degrees below the horizon. Nearby planets like Venus and bright stars like Sirius are visible during this period. [3] "Nautical" twilight continues until the Sun is 12 degrees below the horizon. [4] During nautical twilight, the horizon is visible enough for navigation. [5] "Astronomical ...

  6. Town in Alaska won't see the sun for two months as it enters ...

    www.aol.com/town-alaska-wont-see-sun-191928466.html

    Civil twilight refers to the part of the day when the sun is within 6 degrees below the horizon. In Utqiaġvik, civil twilight ranges from roughly 3 hours on the winter solstice to 6 hours on the ...

  7. Why meteorological and astronomical winter start on 2 ...

    www.aol.com/weather/why-meteorological...

    Astronomical winter always starts on the solstice, which falls between Dec. 20 and Dec. 22. These dates vary from year to year due to leap years and the elliptical shape of Earth's orbit around ...

  8. 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]

  9. Winter solstice 2024: The shortest day of the year is arriving

    www.aol.com/winter-solstice-2024-shortest-day...

    For the more than 6 billion people living in the Northern Hemisphere, this astronomical event signals not only the shortest day but also the longest night of the year.