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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.
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. Different terms have been used to describe these areas as national ...
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]
Name Image Year built Location & coordinates Class of Light [3] Focal height [3] NGA number [3] Admiralty number [3] Range nml [3]; Biển Sơn Lighthouse: Image: 1962: Nghi Sơn Thanh Hóa province
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The code name for the CIA in Long Tieng and the compound in which CIA personnel worked was "Sky,' named after Daniels' home state of Montana, "Big Sky Country." The Long Tieng valley consisted mostly of a 4,400 feet (1,300 m) runway surrounded by a Hmong settlement of several thousand people.
The myth of Thần Trụ Trời tells that when the world was just a dark and chaotic area, a god with extraordinary appearance and strength appeared. God raised his head to the sky, dug the earth himself, and smashed rocks to form a pillar to support the sky. The work went on like this, and soon heaven and earth were divided.