International Dark Sky Community (IDSC): A town, city or any other legally formed municipality having shown evidence of exceptional commitment to preservation of the night sky. Essential activities include implantation and application of regulations on exterior lighting as well as public education on the importance of a dark sky.
International Dark Sky Park (IDSP): A protected public land, such as a park, having a night sky of exceptional quality as well as a nocturnal environment lacking light pollution. Natural darkness within the area must be considered of prime importance for cultural, esthetic and educational reasons.
International Dark Sky Reserve (IDSR): A public or private land that offers an exceptional quality of the nocturnal environment and the night sky. This extensive tract of land is protected for its scientific, natural, educational and cultural heritage and/ or for its mission to offer a vast territory for public enjoyment. An IDSR is composed of a central region that fulfills the minimum criteria for natural darkness, as well as a peripheral region that supports and benefits from a dark sky in the central region. The IDSR is thus based on a partnership between the different property owners and/ or administrators in the territory who publicly recognize the value of the night sky through regulations, formal agreements and long-term planning.