To install click the Add extension button. That's it.

The source code for the WIKI 2 extension is being checked by specialists of the Mozilla Foundation, Google, and Apple. You could also do it yourself at any point in time.

4,5
Kelly Slayton
Congratulations on this excellent venture… what a great idea!
Alexander Grigorievskiy
I use WIKI 2 every day and almost forgot how the original Wikipedia looks like.
What we do. Every page goes through several hundred of perfecting techniques; in live mode. Quite the same Wikipedia. Just better.
.
Leo
Newton
Brights
Milds

From Wikipedia, the free encyclopedia

Landers, California at astronomical dusk (20-second exposure)
Dusk in Marina Bay at 19:34 (nautical dusk)

Dusk occurs at the darkest stage of twilight, or at the very end of astronomical twilight after sunset and just before nightfall.[1] At predusk, during early to intermediate stages of twilight, enough light in the sky under clear conditions may occur to read outdoors without artificial illumination; however, at the end of civil twilight (when Earth rotates to a point at which the center of the Sun's disk is 6° below the local horizon), such lighting is required to read outside.[2] The term dusk usually refers to astronomical dusk, or the darkest part of twilight before night begins.

YouTube Encyclopedic

  • 1/3
    Views:
    228 456
    18 679
    16 300
  • The Three Types of Twilight, and The Days Without Night
  • EXPERIMENT - Twilight Phases Timelapse || How&Why Real Life #Experiment #1
  • Twilight Phases of Earth [1080p]

Transcription

Technical definitions

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] However, technically, the three stages of dusk are as follows:

Astronomical twilight as seen from a plane window
  • At civil dusk, the center of the Sun's disc goes 6° below the horizon in the evening. It marks the end of civil twilight, which begins at sunset. At this time objects are still distinguishable and depending on weather conditions some stars and planets may start to become visible to the naked eye. The sky has many colors at this time, such as orange and red. Beyond this point artificial light may be needed to carry out outdoor activities, depending on atmospheric conditions and location.
  • At nautical dusk, the Sun moves to 12° below the horizon in the evening. It marks the end of nautical twilight, which begins at civil dusk. At this time, objects are less distinguishable, and stars and planets appear to brighten.
  • At astronomical dusk, the Sun's position is 18° below the horizon in the evening. It marks the end of astronomical twilight, which begins at nautical dusk. After this time the Sun no longer illuminates the sky, and thus no longer interferes with astronomical observations.[2][5]

Gallery

See also

References

  1. ^ The Random House College Dictionary, "dusk".
  2. ^ a b "Rise, Set, and Twilight Definitions". USNO. Archived from the original on 2019-09-27. Retrieved 2015-06-19.
  3. ^ Van Flandern, T.; K. Pulkkinen (1980). "Low precision formulae for planetary positions". Astrophysical Journal Supplement Series. 31 (3): 391. Bibcode:1979ApJS...41..391V. doi:10.1086/190623.
  4. ^ "Full definition of Dusk".
  5. ^ "Dusk – Definition and Meaning". www.timeanddate.com.
This page was last edited on 13 March 2024, at 17:05
Basis of this page is in Wikipedia. Text is available under the CC BY-SA 3.0 Unported License. Non-text media are available under their specified licenses. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc. WIKI 2 is an independent company and has no affiliation with Wikimedia Foundation.