TUCSON, July 16 — DarkSky International, the nonprofit originally founded as the International Dark-Sky Association, has grown from a niche advocacy group into a global force with over 193,000 supporters and more than 65 chapters worldwide as of 2026. The organisation, headquartered in the United States, was established in 1988 by professional astronomer David Crawford and physician and amateur astronomer Tim Hunter.
Its stated mission is “to preserve and protect the night time environment and our heritage of dark skies through quality outdoor lighting.” The technical reality of light pollution, as DarkSky defines it, stems from improperly shielded outdoor lighting. This produces three distinct problems: glare, which directs light directly into human eyes; skyglow, where light is scattered above the horizon and washes out the night sky; and light trespass, where unwanted illumination spills into areas such as neighbours’ yards.
The organisation’s principal approach involves raising awareness about the value of dark, star-filled night skies and encouraging protection and restoration through education on outdoor lighting practices that reduce light pollution.
From 5,000 Members to a Global Movement
In 2011, DarkSky had roughly 5,000 members across 70 countries. By 2026, that number had grown to over 193,000 supporters, with chapters spanning more than 65 locations worldwide. The organisation is the first and largest in what has become known as the dark-sky movement.
DarkSky’s primary tool for driving change is the International Dark Sky Places program. This initiative encourages communities, parks, and protected areas globally to preserve dark sites through responsible lighting policies and public education.
The program includes five distinct designation types: International Dark Sky Sanctuaries, International Dark Sky Parks, International Dark Sky Reserves, International Dark Sky Communities, and Urban Night Sky Places.
The Darkest Places on Earth
Dark Sky Sanctuaries are described by the organisation as the most remote and often darkest places, with fragile conservation states. Examples include Aotea / Great Barrier Island in New Zealand, designated in 2017; Niue, which in 2020 became the first entire country to receive the designation; and the Boundary Waters Canoe Area Wilderness in Minnesota, USA, also designated in 2020.
International Dark Sky Parks include Natural Bridges National Monument in Utah, designated in 2006; Cherry Springs State Park in Pennsylvania, designated in 2008; and Galloway Forest Park in Scotland, UK, designated in 2009. These designations require participating sites to adopt and enforce specific outdoor lighting policies that minimise light pollution.
Satellites and the New Frontier
The organisation’s work increasingly addresses satellite brightness. Large satellite constellations contribute to skyglow and interfere with astronomical observations. This is a growing concern as the number of objects in low Earth orbit continues to rise, adding a new dimension to the fight against light pollution that goes beyond terrestrial lighting fixtures.
The organisation’s growth trajectory, from 5,000 members in 2011 to over 193,000 supporters by 2026, suggests that public awareness of light pollution and its impacts is expanding.
