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 6ยฐ 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.
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 6ยฐ 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 12ยฐ 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 18ยฐ 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]
^"Dusk โ Definition and Meaning". www.timeanddate.com.
January 01, 1970
dusk, confused, with, sunset, evening, other, uses, disambiguation, this, article, needs, additional, citations, verification, please, help, improve, this, article, adding, citations, reliable, sources, unsourced, material, challenged, removed, find, sources, . Not to be confused with Sunset or Evening For other uses see Dusk disambiguation This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Dusk news newspapers books scholar JSTOR June 2018 Learn how and when to remove this message 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 Landers California at astronomical dusk 20 second exposure Dusk in Marina Bay at 19 34 nautical dusk Contents 1 Technical definitions 2 Gallery 3 See also 4 ReferencesTechnical definitions edit nbsp 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 nbsp 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 edit nbsp Scots pine at early dusk in New Forest England nbsp Dusk at the shore nbsp Looking eastwards at dusk nbsp Sandakan Malaysia at dusk nbsp Beached boats at dusk nbsp Curitiba at dusk BrazilSee also editDawn Sunrise Sunset TwilightReferences edit The Random House College Dictionary dusk a b Rise Set and Twilight Definitions USNO Archived from the original on 2019 09 27 Retrieved 2015 06 19 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 Full definition of Dusk Dusk Definition and Meaning www timeanddate com Retrieved from https en wikipedia org w index php title Dusk amp oldid 1213536602, wikipedia, wiki, book, books, library,
