blue hour

      Blue hour GudangMovies21 Rebahinxxi LK21

      The blue hour (from French l'heure bleue; pronounced [lœʁ blø]) is the period of twilight (in the morning or evening, around the nautical stage) when the Sun is at a significant depth below the horizon. During this time, the remaining sunlight takes on a mostly blue shade. This shade differs from the colour of the sky on a clear day, which is caused by Rayleigh scattering.
      The blue hour occurs when the Sun is far enough below the horizon so that the sunlight's blue wavelengths dominate due to the Chappuis absorption caused by ozone. Since the term is colloquial, it lacks an official definition such as dawn, dusk, or the three stages of twilight. Rather, blue hour refers to the state of natural lighting that usually occurs around the nautical stage of the twilight period (at dawn or dusk).
      The blue hour is shorter in regions near the equator due to the sun rising and setting at steep angles. In places closer to the poles, the illumination and twilight periods are longer as the sun rises and sets at shallower angles.


      Explanation and times of occurrence


      The still commonly presented incorrect explanation claims that Earth's post-sunset and pre-sunrise atmosphere solely receives and disperses the sun's shorter blue wavelengths and scatters the longer, reddish wavelengths to explain why the hue of this hour is so blue. In fact, the blue hour occurs when the Sun is far enough below the horizon so that the sunlight's blue wavelengths dominate due to the Chappuis absorption caused by ozone.
      When the sky is clear, the blue hour can be a colourful spectacle, with the indirect sunlight tinting the sky yellow, orange, red, and blue. This effect is caused by the relative diffusibility of shorter wavelengths (bluer rays) of visible light versus the longer wavelengths (redder rays). During the blue "hour", red light passes through space while blue light is scattered in the atmosphere, and thus reaches Earth's surface.
      Blue hour usually lasts about 20–96 minutes right after sunset and right before sunrise. Time of year, location, and air quality all have an influence on the exact time of blue hour. For instance in Egypt (every 21st of June), when sunset is at 7:59 PM: blue hour occurs from 7:59 PM to 9:35 PM. When sunrise is at 5:54 AM: blue hour occurs from 4:17 AM to 5:54 AM. Golden hour occurs from 5:54 AM to 6:28 AM and from 7:25 PM to 7:59 PM.


      Art

























      Photography


      Many artists value this period for the quality of the soft light. Although the blue hour does not have an official definition, the blue color spectrum is most prominent when the Sun is between 4° and 8° below the horizon.
      Photographers use blue hour for the tranquil mood it sets. When photographing during blue hour it can be favourable to capture subjects that have artificial light sources, such as buildings, monuments, cityscapes, or bridges.



















      See also


      Color temperature
      Green flash
      Golden hour (photography)


      Notes




      References




      External links



      Blue hour mobile application (iOS, Iphone/iPad)
      bluehoursite.com: Everything about Blue Hour and Night Photography (news, articles, tips and calculator)
      Twilight Calculator, Golden Hour/Blue Hour table

      Blue Hour GudangMovies21 Rebahinxxi LK21

      Blue Hour is a collaboration album by jazz saxophonist Stanley Turrentine and The Three Sounds recorded in 1961 for the Blue Note label and performed by Turrentine with Gene Harris, Andrew Simpkins and Bill Dowdy. The album was reissued in 2000 with an additional disc of unreleased recordings, as Blue Hour: The Complete Sessions (Blue Note 24586).


      Reception



      The Allmusic review by Ken Dryden awarded the 2000 2CD Reissue 3 stars and describes it as "a very relaxed and bluesy release". The original album was awarded 4½ stars by Michael Erlewine of Allmusic.


      Track listing


      Original LP

      "I Want a Little Girl" (Murray Mencher, Billy Moll) – 7:03
      "Gee Baby, Ain't I Good to You" (Andy Razaf, Don Redman) – 5:20
      "Blue Riff" (Gene Harris) – 6:26
      "Since I Fell for You" (Buddy Johnson) – 8:46
      "Willow Weep for Me" (Ann Ronell) – 9:55
      Bonus tracks on Blue Hour: The Complete Sessions CD 2:

      "Blues in the Closet" (Pettiford) – 5:00
      "Just in Time" (Comden, Green, Styne) – 5:40
      "Gee Baby, Ain't I Good to You" [Alternate Take] – 5:33
      "Where or When" (Hart, Rodgers) – 7:00
      "Blue Hour" (Gene Harris) – 5:14
      "There Is No Greater Love" (Jones, Symes) – 8:24
      "Alone Together" (Dietz, Schwartz) – 4:40
      "Strike up the Band" (George Gershwin, Ira Gershwin) – 5:24
      Recorded on December 16, 1960 (original LP & CD 2 tracks 1–3) and June 29, 1960 (CD 2 tracks 4–8).


      Personnel


      Stanley Turrentine – tenor saxophone
      Gene Harris – piano
      Andrew Simpkins – bass
      Bill Dowdy – drums


      = Production

      =
      Alfred Lion – producer
      Reid Miles – design
      Rudy Van Gelder – audio engineer
      Francis Wolff – photography


      References

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    blue hour

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    Blue hour - Wikipedia

    The blue hour (from French l'heure bleue; [1][a] pronounced [lœʁ blø]) is the period of twilight (in the morning or evening, around the nautical stage) when the Sun is at a significant depth below the horizon. During this time, the remaining sunlight takes on a mostly blue shade.

    What is Blue Hour and What Makes it So Special for Photography?

    Jul 19, 2019 · Blue hour is simply the time of day before sunrise and after sunset when the atmosphere has a deep, dark blue color. Like the famous “golden hour,” blue hour is not really an hour. Its exact length depends on your latitude, time of year, and weather conditions.

    Blue Hour – Magic Hour - timeanddate.com

    The blue hour refers to the darker stages of morning and evening twilight, when the Sun is quite far below the horizon, coloring the sky deep blue. Like the golden hour , it is a favorite with painters and photographers.

    Blue hour and golden hour (morning and evening), schedule.

    2 days ago · Blue hour — a period of time shortly before sunrise (or after sunset), when the sky turns intense blue, due to which saturated blue shades begin to prevail in natural light.

    What is the blue hour? | Earth | EarthSky

    Aug 30, 2014 · The blue hour generally lasts the 20 to 30 minutes just after sunset and just before sunrise. For example, if the sun sets at 5 p.m., the blue hour would last from approximately 5:10 p.m....

    What Is the Blue Hour? Learn About This Magic Time Between ... - Treehugger

    Jun 5, 2017 · The blue hour typically occurs for about 40 minutes twice a day — once right before the sun pops up in the morning and once right after the sun dips below the horizon following the...

    Blue Hour: The Photographer's Guide - PetaPixel

    Oct 19, 2022 · Similar to golden hour, blue hour is not exactly one hour. Instead, it varies based on location, the weather, and the time of year. Generally speaking, blue hour is about half an …

    Blue Hour Photography: A Comprehensive Guide (With 7 Tips)

    In photography, the ‘blue hour’ is a term used to describe the period before sunrise and after sunset when the sun is below the horizon, resulting in a beautiful blue sky. Sandwiched between night-time and the golden hours of sunrise and sunset, blue hour provides two …

    Understanding Golden Hour, Blue Hour and Twilights - PetaPixel

    Jun 11, 2014 · Using the Planner, you can easily know the schedules of twilights (civil, nautical and astronomical), golden hour and blue hour for any date and location on the planet.

    All you need to know about the blue hour in photography

    Dec 26, 2024 · The blue hour refers to the period of twilight when the sun is just below the horizon, casting a soft blue glow across the sky. Scientifically, this happens because the sun’s light scatters in the atmosphere, emphasizing shorter wavelengths, such as blue.