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The dark-sky movement is a campaign to reduce light pollution.The advantages of reducing light pollution include an increased number of stars visible at night, reducing the effects of electric lighting on the environment, improving the well-being, [1] health [2] and safety [3] of people and wildlife, [4] and cutting down on energy usage.
DarkSky International, formerly the International Dark-Sky Association (IDA), [1] is a United States–based non-profit organization incorporated in 1988 by founders David Crawford, a professional astronomer, and Tim Hunter, a physician and amateur astronomer.
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 .
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In 1987, together with David Crawford, he founded the International Dark-Sky Association, which has grown to more than 10,000 members in 75 countries (as of 2007). His effort in this field brought him the Presidential Award of the Astronomical League in 2004 and the Amateur Achievement Award of the Astronomical Society of the Pacific in 2005.
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A dark-sky preserve status enables high-quality astronomical observation in Paranal Observatory. [1]A dark-sky preserve (DSP) is an area, usually surrounding a park or observatory, that restricts or reduces light pollution or maintains and protects naturally dark night skies.
International Dark Sky Week (formerly the National Dark Sky Week) is held during the week of the new moon in April, [1] [2] when people worldwide may turn off their lights to observe the beauty of the night sky without light pollution. This event was founded in 2003 by high school student Jennifer Barlow of Midlothian, Virginia. [3]