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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. John E. Bortle - Wikipedia

    en.wikipedia.org/wiki/John_E._Bortle

    John E. Bortle is an American amateur astronomer. He is best known for creating the Bortle scale to quantify the darkness of the night sky. Bortle has made a special study of comets. He has recorded thousands of observations relating to more than 300 comets. From 1977 until 1994 he authored the monthly '"Comet Digest" in Sky and Telescope magazine.

  5. 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.

  6. 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 ...

  7. NFL playoff scenarios Week 15: Vikings, Steelers, Texans have ...

    www.aol.com/nfl-playoff-scenarios-week-15...

    With just one game down in Week 15, one NFL team's clinching scenario is already off the table. A tie between the Los Angeles Rams and San Francisco 49ers on Thursday night would have kept alive ...

  8. Sky quality meter - Wikipedia

    en.wikipedia.org/wiki/Sky_Quality_Meter

    The values reported by the SQM are in units of magnitudes per square arcsecond (mag arcsec-2).Typically, the data provided by SQMs are recorded in magnitudes, denoted as m or mag, specifically in mSQM (or magSQM), where the subscript SQM indicates that the measured radiance is calculated by weighting the electromagnetic radiation according to the spectral responsivity of these instruments. [5]

  9. Hannah Kobayashi Has Been Found a Month After Voluntarily ...

    www.aol.com/lifestyle/hannah-kobayashi-found...

    Hannah Kobayashi's family says she was "found safe" on Wednesday, Dec. 11, about a month after she walked into Mexico and vanished in what police have called a voluntary disappearance that made ...