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  2. Ultraviolet index - Wikipedia

    en.wikipedia.org/wiki/Ultraviolet_index

    The UV index is a number linearly related to the intensity of sunburn-producing UV radiation at a given point on the Earth's surface. It cannot be simply related to the irradiance (measured in W / m 2 ) because the UV of greatest concern occupies a spectrum of wavelengths from 295 to 325 nm, and shorter wavelengths have already been absorbed a ...

  3. List of English districts by area - Wikipedia

    en.wikipedia.org/wiki/List_of_English_districts...

    The area is defined as 'area to mean high water excluding inland water'. [ 2 ] The list consists of 164 non-metropolitan districts , 32 London boroughs , 36 metropolitan boroughs , 62 unitary authorities , and two sui generis authorities (the City of London and the Isles of Scilly ).

  4. Geography of the United Kingdom - Wikipedia

    en.wikipedia.org/.../Geography_of_the_United_Kingdom

    [a] [1] Scotland at 78,801 square kilometres (30,425 sq mi), is second largest, accounting for about a third of the area of the UK. [a] [1] Wales and Northern Ireland are much smaller, covering 20,783 and 14,330 square kilometres (8,024 and 5,533 sq mi) respectively. [a] [1] The area of the countries of the United Kingdom is set out in the ...

  5. File:English regions and counties coloured by type map 2023 ...

    en.wikipedia.org/wiki/File:English_regions_and...

    English: Map showing the Regions of England and the constituent metropolitan and non-metropolitan counties from 1 April 2023. Equirectangular map projection on WGS 84 datum, with N/S stretched 170% Geographic limits: West: 6.75°W; East: 2.0°E; North: 56.0°N; South: 49.75°N; Changes since the 2021 version: New unitary authority areas: Cumberland

  6. UV mapping - Wikipedia

    en.wikipedia.org/wiki/UV_mapping

    The image is called a UV texture map. [1] The UV mapping process involves assigning pixels in the image to surface mappings on the polygon, usually done by "programmatically" copying a triangular piece of the image map and pasting it onto a triangle on the object. [ 2 ]

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  8. Ultraviolet - Wikipedia

    en.wikipedia.org/wiki/Ultraviolet

    Ultraviolet radiation, also known as simply UV, is electromagnetic radiation of wavelengths of 10–400 nanometers, shorter than that of visible light, but longer than X-rays. UV radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the Sun.

  9. International Ultraviolet Explorer - Wikipedia

    en.wikipedia.org/wiki/International_Ultraviolet...

    The mission was first proposed in early 1964, by a group of scientists in the United Kingdom, and was launched on 26 January 1978, 17:36:00 UTC aboard a NASA Thor-Delta 2914 launch vehicle. The mission lifetime was initially set for 3 years, but in the end, it lasted 18 years, with the satellite being shut down in 1996.