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https://en.wikipedia.org/wiki/Twilight#:~:text=At%20latitudes%20within%209%20degrees%20of%20either%20Pole%2C,weeks%20the%20further%20toward%20the%20Pole%20one%20goes.
https://en.wikipedia.org/wiki/Twilight
Twilight is the illumination of the lower atmosphere when the Sun is not directly visible because it is below the horizon. Twilight is produced by sunlight scattering in the upper atmosphere, illuminating the lower atmosphere so that Earth's surface is neither completely lit nor completely dark. The word twilight is also used to denote the periods of time when this illumination …
https://www.weather.gov/fsd/twilight
In its most general sense, twilight is the period of time before sunrise and after sunset, in which the atmosphere is partially illuminated by the sun, being neither totally dark or completely lit. However there are three categories of twilight that are defined by how far the sun is below the horizon. Civil Twilight:
https://earthsky.org/earth/twilight-2/
In mid latitudes, astronomical twilight can last about 1/2 hour from fall through spring but up to an hour in summer. Astronomical twilight begins about an hour to 1 1/2 hours after sunset for mid...
https://www.eldoradoweather.com/current/sunchart/daylight-twilight.html
Twilight. Twilight is the time between dawn and sunrise, and the time between sunset and dusk. Sunlight scattered in the upper atmosphere illuminates the lower atmosphere, and the surface of the Earth is neither completely lit nor completely dark. The sun itself is not actually visible because it is below the horizon.
https://www.visualexpert.com/Resources/twilightcriterion.html
During civil twilight, approximately the first half hour after sunset, ground illuminance in good weather declines by a factor of about 100, from roughly 330 lux to 3.2 lux. The U.S. Naval Observatory describes civil twilight as a time for "terrestrial objects to be clearly distinguished," 1 an assertion supported by performance data on tasks such as acuity, contrast sensitivity and …
https://avcams.faa.gov/sunrise_sunset.php
Sunrise / Sunset / Twilight Calculator. This calculator can be used to calculate sunrise, sunset, and civil/nautical twilight for any place on Earth by entering Latitude and Longitude either in decimal degrees (ie: 61.575590) or degrees/minutes/seconds (ie: 61:34:32).
https://www.timeanddate.com/astronomy/uk/london
Astro. Twilight: 5:44 am – 6:24 am: Nautical Twilight: 6:24 am – 7:07 am: Civil Twilight: 7:07 am – 7:46 am: Daylight: 7:46 am – 3:53 pm: Civil Twilight: 3:53 pm – 4:32 pm: Nautical Twilight: 4:32 pm – 5:15 pm: Astro. Twilight: …
http://www.date-and-time.net/
In Berlin (Germany 52.33 degrees North, 13.22 degrees East), after the morning twilight at 06:52 am (LT), will be today at 07:35 am (LT) sunrise. Today's sunset is at 04:08 pm (LT). Until the next sunrise on 17-11-2021 at 07:37 am (LT), after the evening twilight at 04:50 pm (LT), it will be night.
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