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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. Telescopium - Wikipedia

    en.wikipedia.org/wiki/Telescopium

    Download as PDF; Printable version; ... Seen in the 1824 star chart set Urania's Mirror ... "The Bortle Dark-Sky Scale".

  6. Category:Amateur astronomy - Wikipedia

    en.wikipedia.org/wiki/Category:Amateur_astronomy

    Download QR code; Print/export Download as PDF; Printable version; In other projects Wikimedia Commons; ... Bortle scale; C. Cherry Springs State Park; Clear Sky ...

  7. 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.

  8. Bortle Dark Sky Scale - Wikipedia

    en.wikipedia.org/?title=Bortle_Dark_Sky_Scale&...

    Pages for logged out editors learn more. Contributions; Talk; Bortle Dark Sky Scale

  9. Delta Sextantis - Wikipedia

    en.wikipedia.org/wiki/Delta_Sextantis

    According to the Bortle scale, that means it can be viewed from dark suburban skies. This is a B-type main sequence star with a stellar classification of B9.5 V; [3] just shy of being a cooler A-type star. It is estimated to have 2.6 [6] times the Sun's mass and 2.3 [7] times the radius of the Sun.