Darkening may refer to: * Darkening (ophthalmology), vision loss or weakness that occurs without an apparent lesion affecting the eye * Darkening of Tristram, an event taking place prior and during '' Diablo'', during which the main antagonist Diablo tried to break free of his imprisonment and laid siege to the town of Tristram. It is also the name of the time-limited event in ''

Diablo III ''Diablo III'' is a hack-and-slash action role-playing game developed and published by Blizzard Entertainment as the third installment in the Diablo (series), ''Diablo'' franchise. It was released for Microsoft Windows and OS X in May 2012, Play ...

'' that marks the anniversary of the first game's original release. *

Darkening of Valinor Darkening may refer to: * Darkening (ophthalmology), vision loss or weakness that occurs without an apparent lesion affecting the eye * Darkening of Tristram, an event taking place prior and during '' Diablo'', during which the main antagonist Di ...

, the destruction of the Two Trees of Valinor in the fictional universe of J. R. R. Tolkien's Middle-earth *

Gravity darkening Gravity darkening, also referred to as gravity brightening, is an astronomical phenomenon where the poles of a star are brighter than the equator, due to rapid rotation and oblate shape. When a star is oblate, it has a larger radius at its equa ...

, an astronomical phenomenon *

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 (OH)—a chemical compound that interferes with the passage of light through ...

, a physical degradation of the optical properties of glass *

Limb darkening Limb darkening is an optical effect seen in stars (including the Sun), where the central part of the disk appears brighter than the edge, or ''limb''. Its understanding offered early solar astronomers an opportunity to construct models with such ...

, the diminishing of intensity in the image of a star as one moves from the center to the edge

See also