International Dark Sky (IDA) was founded in 1988 by David Crawford a professional astronomer and Tim Hunter a physician/amateur astronomer. The mission of the IDA is "to preserve and protect the night time environment and our heritage of dark skies through quality outdoor lighting." The IDA became the first organization to be involved in the dark-sky movement and now has become the largest organization involved. They have continued to make significant strides in leading the movement to protect night from light pollution. And their impact has reached 51 countries through its members, advocates, and dark sky places that are located all over the globe.
International Dark Sky Week was created by Jennifer Barlow in 2003. It focuses on problems associated with light pollution and promotes the solutions to mitigate it. It is a key component of Global Astronomy Month and has grow to become a worldwide event.
- 50 IDA chapters that are located all over the world and are made up of activists who advocate in their community for the protection of the night skies. These chapters help organize events and work to educate their community and government officials on the importance of protecting night skies, eco-friendly outdoor lighting, and much more.
- The IDA provides IDA chapters, members, volunteers and the public with educational materials to help impact their community on the importance of protecting night skies.
- Publish Night Watch an electronic newsletter and Nightscape a printed newsletter that provides members and the public updates on light pollution, IDA programs, eco-friendly lighting and how they can make a difference in their community.
- Dark Sky Places Program that promotes night sky conservation across the globe.
Activities and Events