Dusk 191064 221399570 2008-06-24T10:05:15Z Arkuat 29003 removing merge tag. Discussion on talk page looks like a consensus oppose, and there is no tag suggesting merging [[dawn]] into [[twilight]] [[Image:Dusk_over_Chennai.png|thumb|300px|Dusk over [[St. Thomas Mount]], [[Chennai]], [[India]].]] [[Image:Dusk-A330.JPG|thumb|300px|Dusk outside a plane on cruise.]] {{other uses|Dusk (disambiguation)}} '''Dusk''' refers to the [[twilight]] after [[sunset]]. '''Civil dusk''' is the time at which the [[sun]] is 6 [[degree (angle)|degree]]s below the [[horizon]] in the evening. At this time objects are distinguishable and some stars and planets are visible to the naked eye.<ref name="NOAA_Astro_Terms">{{cite web | url = http://www.srh.noaa.gov/ffc/html/gloss3.shtml | title = Astronomical Terms | author = [[National Oceanic and Atmospheric Administration]] }}</ref> '''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.<ref name="NOAA_Astro_Terms"/> '''Astronomical dusk''' is 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.<ref name="NOAA_Astro_Terms"/> Dusk should not be confused with [[sunset]], which is the moment when the trailing edge of the Sun itself sinks below the horizon.<ref name="NOAA_Astro_Terms"/> ==References== {{Reflist}} ==See also== *[[Dawn]] *[[Twilight]] *[[Evening]] [[Category:Earth phenomena]] [[Category:Parts of a day]] [[Category:Night]] [[ar:شفق]] [[eo:Sunsubiro]] [[he:בין השמשות]] [[ja:薄暮]] [[sv:Skymning]] [[bat-smg:Žara]] [[zh:薄暮]]