• Darkening (ophthalmology), vision loss or weakness that occurs without an apparent lesion affecting the eye
• Darkening of Valinor, the destruction of the Two Trees of Valinor in in the fictional universe of J. R. R. Tolkien's Middle-earth
• Gravity darkening
  Gravity darkening
  Gravity darkening, also referred to as Gravity Brightening, is an astronomical phenomenon where a star rotates so rapidly that it has a detectably oblate spheroid shape, such as in Regulus in the Leo constellation....
  
  , an astronomical phenomenon
• Hydrogen darkening
  Hydrogen darkening
  Hydrogen darkening is a physical degradation of the optical properties of glass. Free hydrogen atoms are able to bind to the SiO2 silica glass compound forming hydroxyl - a chemical compound that interferes with the passage of light through the glass....
  
  , a physical degradation of the optical properties of glass
• Limb darkening
  Limb darkening
  Limb darkening refers to the diminishing of intensity in the image of a star as one moves from the center of the image to the edge or "limb" of the image...
  
  , the diminishing of intensity in the image of a star as one moves from the center to the edge

See also

• Dark (disambiguation)
• Darken (disambiguation)
  Darken (disambiguation)
  Darken is a webcomic set in a Dungeons & Dragons-style fantasy world.- Persons with the surname/given name Darken :* Darken Rahl, a fictional character from Terry Goodkind's The Sword of Truth series...
  
  
• Darker (disambiguation)
  Darker (disambiguation)
  Darker is a 1997 album by C-Tec.Darker may also refer to:* Darker , a 1995 computer game by Psygnosis-See also:* Dharker, Indian-Pakistani family-/surname* Dark...
  
  
• Darkness (disambiguation)
  Darkness (disambiguation)
  Darkness is the absence of light.Darkness may also refer to:in film and television* Darkness , an American independent horror film* Darkness , a Spanish-American horror film...
  
  
• Lighting
  Lighting
  Lighting or illumination is the deliberate application of light to achieve some practical or aesthetic effect. Lighting includes the use of both artificial light sources such as lamps and light fixtures, as well as natural illumination by capturing daylight...