darkening$510709$ - translation to greek
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darkening$510709$ - translation to greek

Limb Darkening; Stellar limb-darkening; Limb brightening; Solar limb
  • filtered]] image of the Sun in visible light, showing the limb-darkening effect as a dimmer luminosity towards the edge or limb of the solar disk. The image was taken during the 2012 [[transit of Venus]] (seen here as the dark spot at the upper right).
  • Limb darkening geometry. The star is centered at ''O''  and has radius ''R'' . The observer is at point ''P''  a distance ''r''  from the center of the star, and is looking at point ''S''  on the surface of the star. From the point of view of the observer, ''S''  is at an angle θ from a line through the center of the star, and the edge or ''limb'' of the star is at angle Ω.

darkening      
n. συσκότιση

Definition

Darkening
·noun Twilight; gloaming.
II. Darkening ·p.pr. & ·vb.n. of Darken.

Wikipedia

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 gradients. This encouraged the development of the theory of radiative transfer.