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  2. Okta - Wikipedia

    en.wikipedia.org/wiki/Okta

    Sky conditions are estimated in terms of how many eighths of the sky are covered in cloud, ranging from 0 oktas (completely clear sky) through to 8 oktas (completely overcast). In addition, in the SYNOP code there is an extra cloud cover indicator '9' indicating that the sky is totally obscured (i.e. hidden from view), usually due to dense fog ...

  3. Sky quality meter - Wikipedia

    en.wikipedia.org/wiki/Sky_Quality_Meter

    Sky Quality Meter model SQM-L. A sky quality meter (SQM) is an instrument used to measure the luminance of the night sky, more specifically the Night Sky Brightness (NSB) at the zenith, with a bandwidth ranging from 390 nm to 600 nm. [1]

  4. Shader - Wikipedia

    en.wikipedia.org/wiki/Shader

    Shaders are written to apply transformations to a large set of elements at a time, for example, to each pixel in an area of the screen, or for every vertex of a model. This is well suited to parallel processing, and most modern GPUs have multiple shader pipelines to facilitate this, vastly improving computation throughput.

  5. Celestial cartography - Wikipedia

    en.wikipedia.org/wiki/Celestial_cartography

    A determining fact source for drawing star charts is naturally a star table. This is apparent when comparing the imaginative "star maps" of Poeticon Astronomicon – illustrations beside a narrative text from the antiquity – to the star maps of Johann Bayer , based on precise star-position measurements from the Rudolphine Tables by Tycho Brahe .

  6. Cloud cover - Wikipedia

    en.wikipedia.org/wiki/Cloud_cover

    Areas around 10-15% below the global mean can be found around 20°N and 20°S, due to an absence of equatorial effects and strong winds reducing cloud formation. [ specify ] On the other hand, in the storm regions of the Southern Hemisphere midlatitudes were found to have with 15–25% more cloudiness than the global mean at 60°S. [ 3 ]

  7. Physically based rendering - Wikipedia

    en.wikipedia.org/wiki/Physically_based_rendering

    Much of this work was done at the Cornell University Program of Computer Graphics; a 1997 paper from that lab [1] describes the work done at Cornell in this area to that point. "Physically Based Shading" was introduced by Yoshiharu Gotanda during the course Physically-Based Shading Models in Film and Game Production at the SIGGRAPH 2010.

  8. Norton's Star Atlas - Wikipedia

    en.wikipedia.org/wiki/Norton's_Star_Atlas

    Norton's Star Atlas is a set of 16 celestial charts, first published in 1910 and currently in its 20th edition under the editorship of Ian Ridpath.The Star Atlas covers the entire northern and southern sky, with accompanying reference information for amateur astronomers.

  9. OpenGL Shading Language - Wikipedia

    en.wikipedia.org/wiki/OpenGL_Shading_Language

    Other functions like abs, sin, pow, etc, are provided but they can also all operate on vector quantities, i.e. pow(vec3(1.5, 2.0, 2.5), abs(vec3(0.1, -0.2, 0.3))). GLSL supports function overloading (for both built-in functions and operators, and user-defined functions), so there might be multiple function definitions with the same name, having ...

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