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  2. Bortle scale - Wikipedia

    en.wikipedia.org/wiki/Bortle_scale

    The Bortle dark-sky scale (usually referred to as simply the Bortle scale) is a nine-level numeric scale that measures the night sky's brightness of a particular location. It quantifies the astronomical observability of celestial objects and the interference caused by light pollution .

  3. Light pollution - Wikipedia

    en.wikipedia.org/wiki/Light_pollution

    The Bortle scale is a nine-level measuring system used to track how much light pollution there is in the sky. A Bortle scale of four or less is required to see the Milky Way whilst one is "pristine", the darkest possible.

  4. Cherry Springs State Park - Wikipedia

    en.wikipedia.org/wiki/Cherry_Springs_State_Park

    The sky at Cherry Springs has been classified as a 2 on the Bortle Dark-Sky Scale, meaning it has almost no light pollution. [52] Such "truly dark, starry skies are unavailable to two-thirds of the world's population, including 99 percent of people in the continental U.S. and Western Europe". [3]

  5. Dark-sky preserve - Wikipedia

    en.wikipedia.org/wiki/Dark-sky_preserve

    A dark-sky preserve (DSP) is an area, usually surrounding a park or observatory, that restricts or reduces light pollution or maintains and protects naturally dark night skies. Different terms have been used to describe these areas as national organizations and governments have worked independently to create programs.

  6. Globe at Night - Wikipedia

    en.wikipedia.org/wiki/GLOBE_at_Night

    Globe at Night is an international scientific research program that crowdsources measurements of light pollution in the night sky. At set time periods within each year, the project asks people to count the number of stars that they can see from their location and report it to the project's website.

  7. The future looks bright: light pollution rises on a global scale

    www.aol.com/news/2017-11-22-the-future-looks...

    Data showed that Earth's artificially lit outdoor surface at night grew by about 2 percent annually in brightness and area from 2012 to 2016.

  8. Category:Light pollution - Wikipedia

    en.wikipedia.org/wiki/Category:Light_pollution

    Pages in category "Light pollution" The following 27 pages are in this category, out of 27 total. ... Bortle scale; C. Light pollution in China; D. Dark-sky movement;

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