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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. This graphic shows how many more stars you can see under ...

    www.aol.com/news/graphic-shows-many-more-stars...

    In order to describe how much light pollution there is at a particular location, astronomers classify night skies based on the Bortle Scale.

  4. 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.

  5. 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.

  6. Limiting magnitude - Wikipedia

    en.wikipedia.org/wiki/Limiting_magnitude

    The limiting magnitude for naked eye visibility refers to the faintest stars that can be seen with the unaided eye near the zenith on clear moonless nights. The quantity is most often used as an overall indicator of sky brightness, in that light polluted and humid areas generally have brighter limiting magnitudes than remote desert or high altitude areas.

  7. Surface brightness - Wikipedia

    en.wikipedia.org/wiki/Surface_brightness

    In visible and infrared astronomy, surface brightness is often quoted on a magnitude scale, in magnitudes per square arcsecond (MPSAS) in a particular filter band or photometric system. Measurement of the surface brightnesses of celestial objects is called surface photometry.

  8. The End of Night (book) - Wikipedia

    en.wikipedia.org/wiki/The_End_of_Night_(book)

    The nine chapters of Bogard's book map to the nine levels of the Bortle scale, which attempts to quantify the subjective brightness and suitability for astronomy of the sky in different environments. Bogard has said of the scale, invented in 2001, "one of the reasons why identifying different depths of darkness is so important is that we don't ...

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