The International Dark-Sky Association (IDA) is a United States-based non-profit organization incorporated in 1988 by founders Dr. David Crawford, a professional astronomer, and Dr. Timothy Hunter, a physician/amateur astronomer. The mission of the IDA is "to preserve and protect the nighttime environment and our heritage of dark skies through quality outdoor lighting." Light pollution is the result of outdoor lighting that is not properly shielded, allowing light to be directed into the eyes and the night sky. Light that shines into the eyes is called glare and light shining into the night sky above the horizon causes skyglow. Lighting can also cause light trespass when it is directed into areas that it is not wanted, i.e. neighbors yard and windows. IDA was the first organization in the dark-sky movement, and is currently the largest.
Read more about International Dark-Sky Association: Principal Approach, International Dark Sky Places
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