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Bortle 4
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![La Escala de Bortle calcula la calidad del cielo nocturno midiendo el brill... Bortle 4](https://i3.wp.com/www.nacion.com/resizer/EsF1ca5qb6fCoTHRZaSN5LGmZVw=/cloudfront-us-east-1.images.arcpublishing.com/gruponacion/TM7365MKEZCKHP4N6EWRZO6VKY.jpeg?ssl=1)
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Aliste cobija y café para las cuadrántidas: una espectacular lluvia de estrellas
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How dark-sky communities fight light pollution - Curbed
![NGC 1893 - Tadpoles Nebula, Jared Holloway Bortle 4](https://i3.wp.com/cdn.astrobin.com/thumbs/e9fujHUxVwyM_16536x0_TO3qlkcy.jpg?ssl=1)
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NGC 1893 - Tadpoles Nebula (jzholloway) - Полное разрешение
![Find Your Night Sky Brightness on the Bortle Scale Real Life Examples. Bortle 4](https://i3.wp.com/astrobackyard.com/wp-content/uploads/2021/04/light-pollution-bortle-scale.jpg?ssl=1)
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Bortle Scale
![Bortle 4, Canon 5D mk iii (stock), AT60ED at f6, ISO1600, 15 min integrati... Bortle 4](https://i3.wp.com/www.astrofilters.com/wp-content/uploads/2020/10/baader.jpg?ssl=1)
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Baader IR-Cut Moon & Skyglow Neodymium - AstroFilters.com
![The Bortle Scale - used to quantify light pollution - puts Australian citie... Bortle 4](https://i3.wp.com/www.jhaservices.com/wp-content/uploads/2018/06/bortle-scale-dark-night-sky.jpg?ssl=1)
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External lighting design practices for conserving our night sky.
![EPL-6 Samyang 135 f2 Skywatcher Star Adventurer 4Hrs integration time usin... Bortle 4](https://i3.wp.com/images.squarespace-cdn.com/content/v1/5da4368d3b1ad128da99a2ab/1578477807355-NIV64NK7XU1FYEZ3B78H/2019-12-30_Nismes_Alnitak-M42_M42Drizzle3X-fullAPP_EPL6-sammy135-redSA.jpg?ssl=1)
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Deep Sky - Andrea Minoia
![4.5 hours Bortle 4](https://i3.wp.com/www.cloudynights.com/uploads/monthly_04_2023/post-300009-0-02459000-1681457011.jpg?ssl=1)
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Ngc 4565, The Needle Galaxy - Astrodoc: Astrophotography By Ron Brecher B68
![Eridanus Loop - Canon Ra, RF85 f1.2, Bortle 1 - DSLR, Mirrorless. Bortle 4](https://i3.wp.com/www.cloudynights.com/uploads/monthly_10_2021/post-262704-0-42675400-1633978036.jpg?ssl=1)
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Eridanus Loop
![M27 Bortle9+FMoon ASI2400 RC10 UHC+RGB.jpg. d:Special:EntityPageP170. d:Sp... Bortle 4](https://i3.wp.com/upload.wikimedia.org/wikipedia/commons/8/89/M27_Bortle9%2BFMoon_ASI2400_RC10_UHC%2BRGB.jpg?ssl=1)
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File:M27 Bortle9+FMoon ASI2400 RC10 UHC+RGB.jpg - Wikipedia
![...Польши и США, простейшим оборудыванием в условиях сильного светового заг... Bortle 4](https://i3.wp.com/cdn.arstechnica.net/wp-content/uploads/2023/12/M31-Finished.png?ssl=1)
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thagastan - LiveJournal
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