dusk

　 　

WordNet

1. become dusk
2. lighted by or as if by twilight; "The dusky night rides down the sky/And ushers in the morn"-Henry Fielding; "the twilight glow of the sky"; "a boat on a twilit river" (同)twilight, twilit
3. relatively slender blue-grey shark; nearly worldwide in tropical and temperate waters (同)Carcharhinus obscurus
4. common North American salamander mottled with dull brown or greyish-black
5. a wood rat with dusky feet

PrepTutorEJDIC

1. (特に夕暮れの)たそがれ / (ある所の)薄暗がり
2. (色が)黒みがかった / 薄暗い
3. 黒みがかっていること,薄暗さ

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2014/07/18 16:03:23」(JST)

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[Wiki en表示]

For other uses, see Dusk (disambiguation).

Not to be confused with sunset.

Civil, nautical, and astronomical twilight. Dusk is the end of evening twilight.

Dusk is the darkest stage of twilight in the evening. During early to intermediate stages of twilight, there may be enough light in the sky under clear-sky conditions to read outdoors without artificial illumination. Civil dusk occurs when the earth rotates to a point at which the center of the sun is at 6° below the local horizon. This marks the end of the evening civil twilight, the point where artificial illumination is required to read outside. Twilight comes after sunset, which is the point at which the earth has rotated just enough for the sun to be no longer visible on the local horizon (under clear conditions).

Technical definitions

There are also more technical definitions of dusk, including the following:

Civil dusk 

The time at which the sun is 6 degrees below the horizon in the evening. At this time objects are distinguishable and some stars and planets are visible to the naked eye.

Nautical dusk 

Is when the sun is 12 degrees below the horizon in the evening. At this time, objects are no longer distinguishable, and the horizon is no longer visible to the naked eye.

Astronomical dusk 

The time at which the sun is 18 degrees below the horizon in the evening. At this time the sun no longer illuminates the sky, and thus no longer interferes with astronomical observations.

Seattle, Washington at dusk

• Dusk in Porto Covo, west coast of Portugal

• Dusk seen from a plane window

• View from Ibirapuera Park, São Paulo, at dusk

• Dusk in Joshua Tree, California, USA

• Trees silhouette dusk sky

• Dusk in Albi, France

See also

• Dawn
• Sunrise
• Sunset
• Twilight

References

UpToDate Contents

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English Journal

• Cryoballoon ablation as first-line therapy of paroxysmal atrial fibrillation: dusk of global warming and the dawn of a new ice age era?

• Morillo CA.Source1Department of Medicine, Cardiology Division, McMaster University, Hamilton, ON, Canada.
• Europace : European pacing, arrhythmias, and cardiac electrophysiology : journal of the working groups on cardiac pacing, arrhythmias, and cardiac cellular electrophysiology of the European Society of Cardiology.Europace.2012 Feb;14(2):153-4. Epub 2011 Dec 19.
• PMID 22183746

• From Dusk till Dawn: One-Plasmid Systems for Light-Regulated Gene Expression.

• Ohlendorf R, Vidavski RR, Eldar A, Moffat K, Möglich A.SourceHumboldt-Universität zu Berlin, Institut für Biologie, Biophysikalische Chemie, Invalidenstraße 42, 10115 Berlin, Germany.
• Journal of molecular biology.J Mol Biol.2012 Jan 8. [Epub ahead of print]
• Signaling photoreceptors mediate diverse organismal adaptations in response to light. As light-gated protein switches, signaling photoreceptors provide the basis for optogenetics, a term that refers to the control of organismal physiology and behavior by light. We establish as novel optogenetic tool
• PMID 22245580

Japanese Journal

• <Poster Session>Classification of stroke pattern of dugongs in Dungonab Bay, Sudan by using an acoustic data logger

• Ichikawa Kotaro,Khalf alla Adm Badr Eldinn,Arai Nobuaki,Gaiballa Abdelmoneim Karamalla,Nawata Hiroshi
• 20th Symposium of the International Society on Biotelemetry Proceedings, 101-102, 2014-05
• … The quantity of motion decreased during the night and increased before dawn and dusk. …
• NAID 120005439562

• シェアとポスト家族論(第3部|住むことから考える-住むことの現在,<特集>住むことから考える)

• 久保田 裕之
• 建築雑誌 129(1653), 22-23, 2014-01-20
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• 菌床栽培エノキタケを食害するイシハラナミキノコバエの防除法

• 村上 康明
• 日本きのこ学会誌 : mushroom science and biotechnology 21(3), 133-138, 2013-10-31
• 菌床栽培エノキタケに害虫被害が発生したので,生態調査を行い,防除法を検討した.加害昆虫イシハラナミキノコバエは,野外で野生のエノキタケやヒラタケ上にみられた.栽培舎周辺では,廃棄子実体から羽化し,芽出し室へ侵入して加害し,室内での増殖はないと考えられた.また,成虫は栽培舎周辺に朝と夕方に飛来し,昼間は飛来しなかった.これらのことから,このキノコバエは元々の発生源は野生エノキタケとヒラタケであるが, …
• NAID 110009686130

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