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Bortle Dark-Sky Scale
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1	Light pollution is the upward spill of light from street lights, business lighting and house lights, and it is lost into the atmosphere. 1.The image below shows light pollution over the Earth. Credit: NASA, NOAA NGDC, Su Add to Reading List Source URL: observatory.ballarat.net Language: English - Date: 2013-07-17 00:20:24 Space Light pollution Amateur astronomy Bortle Dark-Sky Scale Scales Naked eye Milky Way Limiting magnitude Night sky Observational astronomy Astronomy Light sources
2	Table 2.1: The Bortle dark-sky scale. Class 1 (Excellent) NELM >7.6 Add to Reading List Source URL: www.covingtoninnovations.com Language: English - Date: 2011-04-04 22:16:12 Space Measurement Light pollution Amateur astronomy Bortle Dark-Sky Scale Scales Milky Way Zodiacal light Naked eye Astronomy Observational astronomy Light sources
3	INTERNATIONAL DARK-‐SKY ASSOCIATION 3223 N First Ave - Tucson Arizona[removed][removed]www.darksky.org TO P RESERVE A ND P ROTECT T HE N IGHTTIME E NVIRONMENT Add to Reading List Source URL: www.darksky.org Language: English - Date: 2014-10-21 16:42:37 Light sources Architecture Light-emitting diodes Semiconductor devices Skyglow Stage lighting Bortle Dark-Sky Scale Dark-sky preserve International Dark-Sky Association Light pollution Light Lighting
4	News Release Media Contacts: Rob McCorkle, TPWD, ([removed]or [removed] John Barentine, International Dark-Sky Assn[removed]or [removed] August 6, 2014 Two Texas Parks & Wildlife Add to Reading List Source URL: darksky.org Language: English - Date: 2014-08-06 12:43:44 Texas International Dark-Sky Association Dark-sky preserve Dark-sky movement Bortle Dark-Sky Scale Enchanted Rock Copper Breaks State Park Texas Parks and Wildlife Department Night sky Light pollution Observational astronomy Astronomy
5	INTERNATIONAL DARK-‐SKY ASSOCIATION 3223 N First Ave - Tucson Arizona[removed][removed]www.darksky.org TO P RESERVE A ND P ROTECT T HE N IGHTTIME E NVIRONMENT Add to Reading List Source URL: www.darksky.org Language: English - Date: 2013-05-31 14:14:05 Bortle Dark-Sky Scale Stage lighting Architecture Optics Electromagnetic radiation International Dark-Sky Association Dark-sky preserve Light pollution Skyglow Lighting
6	INTERNATIONAL DARK-‐SKY ASSOCIATION 3223 N First Ave - Tucson Arizona[removed][removed]www.darksky.org TO P RESERVE A ND P ROTECT T HE N IGHTTIME E NVIRONMENT Add to Reading List Source URL: www.darksky.org Language: English - Date: 2013-05-31 14:11:08 Planetary science Light sources Skyglow Stage lighting Bortle Dark-Sky Scale Light-emitting diode 243 Ida International Dark-Sky Association Light pollution Lighting Light
7	News Release Media Contacts: Rob McCorkle, TPWD, ([removed]or [removed] John Barentine, International Dark-Sky Assn[removed]or [removed] August 6, 2014 Two Texas Parks & Wildlife Add to Reading List Source URL: www.darksky.org Language: English - Date: 2014-08-06 12:43:44 Texas International Dark-Sky Association Dark-sky preserve Dark-sky movement Bortle Dark-Sky Scale Enchanted Rock Copper Breaks State Park Texas Parks and Wildlife Department Night sky Light pollution Observational astronomy Astronomy
8	Having trouble viewing this email?Click here International DarkSky Association Night Watch 9 May 2014 Add to Reading List Source URL: www.darksky.org Language: English - Date: 2014-05-28 20:27:23 Light sources Measurement Meteorology International Dark-Sky Association Dark-sky preserve Bortle Dark-Sky Scale Skyglow Night sky Lighting Light pollution Astronomy Observational astronomy
9	“… to preserve and protect the nighttime environment and our heritage of dark skies” 3225 North First Avenue Tucson, AZ 85719, USA tel +[removed]fax +[removed]www.darksky.org Add to Reading List Source URL: www.darksky.org Language: English - Date: 2012-09-25 05:27:47 Measurement International Dark-Sky Association Science Harmony Florida Bortle Dark-Sky Scale Sky International Year of Astronomy Night sky Light pollution Observational astronomy Astronomy
10	Microsoft Word[removed]doc Add to Reading List Source URL: nhastro.com Language: English - Date: 2011-03-11 02:55:50 Bortle Dark-Sky Scale Naked eye Light pollution Limiting magnitude Night sky Sky brightness Milky Way European Southern Observatory Constellation Observational astronomy Astronomy Space