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Dusk occurs at the darkest stage of
The time of dusk is the moment at the very end of astronomical twilight, just before the minimum brightness of the
File:Seattle 3.jpg,
Dusk occurs at the darkest stage of twilight
Twilight is light produced by sunlight scattering in the upper atmosphere, when the Sun is below the horizon, which illuminates the lower atmosphere and the Earth's surface. The word twilight can also refer to the periods of time when this i ...
, or at the very end of astronomical twilight after sunset
Sunset, also known as sundown, is the daily disappearance of the Sun below the horizon due to Earth's rotation. As viewed from everywhere on Earth (except the North and South poles), the equinox Sun sets due west at the moment of both the spr ...
and just before nightfall.''The Random House College Dictionary'', "dusk". 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
The horizon is the apparent line that separates the surface of a celestial body from its sky when viewed from the perspective of an observer on or near the surface of the relevant body. This line divides all viewing directions based on whether i ...
), such lighting is required to read outside. The term ''dusk'' usually refers to astronomical dusk, or the darkest part of twilight before night begins.
Technical definitions
The time of dusk is the moment at the very end of astronomical twilight, just before the minimum brightness of the night sky
The night sky is the nighttime appearance of celestial objects like stars, planets, and the Moon, which are visible in a clear sky between sunset and sunrise, when the Sun is below the horizon.
Natural light sources in a night sky in ...
sets in, or may be thought of as ''the darkest part of evening twilight''. 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 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 apparently 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.
Media
Dusk can be used to create an ominous tone and has been used as a title for many projects. One instance of this is the 2018 first person shooterDusk (video game)
''Dusk'' (stylized in all caps) is a 2018 retro-styled first-person shooter created by American developer David Szymanski and published by New Blood Interactive for Microsoft Windows, macOS, Linux, and Nintendo Switch. The game is produced by ...
by New Blood Interactive whose setting is in a similar lighting as the actual time of day.
Gallery
Seattle
Seattle ( ) is a seaport city on the West Coast of the United States. It is the seat of King County, Washington. With a 2020 population of 737,015, it is the largest city in both the state of Washington and the Pacific Northwest region o ...
, Washington
Washington commonly refers to:
* Washington (state), United States
* Washington, D.C., the capital of the United States
** A metonym for the federal government of the United States
** Washington metropolitan area, the metropolitan area centered o ...
during Nautical twilight
File:PortoCovo February 2008-4.jpg, Civil twilight in Porto Covo
Porto Covo is one of the two civil parishes in the municipality of Sines, located along the western Alentejo coast of Portugal, about south of Lisbon. The population in 2011 was 1,038,Magere Brug
The Magere Brug (English: Skinny Bridge) is a bridge over the river Amstel in Amsterdam, Netherlands. It connects the banks of the river at Kerkstraat, between the Keizersgracht and Prinsengracht.
The central section of the Magere Brug is a basc ...
, Amsterdam – astronomical twilight
File:IbirapueraDusk.jpg, View from Ibirapuera Park, 
São Paulo
São Paulo (, ; Portuguese for ' Saint Paul') is the most populous city in Brazil, and is the capital of the state of São Paulo, the most populous and wealthiest Brazilian state, located in the country's Southeast Region. Listed by the GaW ...
, Brazil, at civil twilight
File:Deep blue sky in twilight with trees and garage.JPG, Trees' silhouettes against dusk sky
File:Albi at dusk - 2014-02-22.jpg, Civil twilight in Albi
Albi (; oc, Albi ) is a commune in southern France. It is the prefecture of the Tarn department, on the river Tarn, 85 km northeast of Toulouse. Its inhabitants are called ''Albigensians'' (french: Albigeois, Albigeoise(s), oc, albigé ...
, France
File:Amoudi Bay at Dusk.jpg, Amoudi Bay
Amoudi Bay is a bay on the Greek Island of Santorini
Santorini ( el, Σαντορίνη, ), officially Thira (Greek: Θήρα ) and classical Greek Thera (English pronunciation ), is an island in the southern Aegean Sea, about 200 km (12 ...
, Santorini
Santorini ( el, Σαντορίνη, ), officially Thira ( Greek: Θήρα ) and classical Greek Thera (English pronunciation ), is an island in the southern Aegean Sea, about 200 km (120 mi) southeast from the Greek mainland. It is t ...
, at dusk
File:Dusk at Hakaniemenranta in Siltasaari, Helsinki, Finland, 2021 July.jpg, Dusk in Siltasaari, Helsinki
Helsinki ( or ; ; sv, Helsingfors, ) is the Capital city, capital, primate city, primate, and List of cities and towns in Finland, most populous city of Finland. Located on the shore of the Gulf of Finland, it is the seat of the region of U ...
, Finland
File:VancouverConventionCenter.JPG, Nautical twilight in Vancouver
Vancouver ( ) is a major city in western Canada, located in the Lower Mainland region of British Columbia. As the most populous city in the province, the 2021 Canadian census recorded 662,248 people in the city, up from 631,486 in 2016. ...
, British Columbia, Canada
See also
*Dawn
Dawn is the time that marks the beginning of twilight before sunrise. It is recognized by the appearance of indirect sunlight being scattered in Earth's atmosphere, when the centre of the Sun's disc has reached 18° below the observer's ...
* Sunrise
Sunrise (or sunup) is the moment when the upper rim of the Sun appears on the horizon in the morning. The term can also refer to the entire process of the solar disk crossing the horizon and its accompanying atmospheric effects.
Terminology
A ...
* Sunset
Sunset, also known as sundown, is the daily disappearance of the Sun below the horizon due to Earth's rotation. As viewed from everywhere on Earth (except the North and South poles), the equinox Sun sets due west at the moment of both the spr ...
* Twilight
Twilight is light produced by sunlight scattering in the upper atmosphere, when the Sun is below the horizon, which illuminates the lower atmosphere and the Earth's surface. The word twilight can also refer to the periods of time when this i ...
References
{{Parts of a day Earth phenomena Parts of a day Night