The Globe at Night program is an international citizen-science campaign to raise public awareness of the impact of light pollution by inviting citizen-scientists to measure their night sky brightness and submit their observations from a computer or smart phone. Light pollution threatens not only the ability to see stars in the night sky, it can also affect energy consumption, wildlife and health.
Light pollution—excessive, misdirected, or obtrusive artificial (usually outdoor)—light has consequences: it washes out starlight in the night sky, interferes with astronomical research, disrupts ecosystems, has adverse health effects and wastes energy.
Nearly 100,000 measurements have been contributed from people in 115 countries during the campaigns each winter/spring over the past 8 years. Citizen scientists can explore this data on the site’s interactive data map, or see how their city did using the regional map generator. The database is usable for comparisons with a variety of other databases, like how light pollution affects the foraging habits of bats.
Globe at Night is a program of the National Optical Astronomy Observatory, the national center for ground-based nighttime astronomy in the United States, operated by the Association of Universities for Research in Astronomy (AURA), under cooperative agreement with the National Science Foundation.