Globe at Night - Sky Brightness Monitoring Network

The Global at Night - Sky Brightness Monitoring Network (GaN-MN) is an international project for long- term monitoring of night sky conditions around the world. The GaN-MN consists of fixed monitoring stations each equipped with a Sky Quality Meter - Lensed Ethernet (SQM-LE), which is a specialized light sensor for night sky brightness (NSB) measurement. NSB data are continuously collected at high sampling frequency throughout the night, and these data will be instantly made available to the general public to provide a real-time snapshot of the global light pollution condition. A single data collection methodology, including data sampling frequency, data selection criteria, device design and calibration, and schemes for data quality control, was adopted to ensure uniformity in the data collected. This is essential for a systematic and global study of the level of light pollution. The data collected will also provide the scientific backbone in our efforts to contribute to dark sky conservation through education to the general public and policy makers. The GaN-MN project is endorsed by the IAU IYL Executive Committee Working Group as a major Cosmic Light program in the International Year of Light.

Sze Leung Cheung

AUTHORS/INSTITUTIONS: S. Cheung, IAU Office for Astronomy Outreach, Mitaka, Tokyo, JAPANS. Cheung, Y. Shibata, H. Agata, National Astronomical Observatory of Japan, Tokyo, JAPANJ.C. Pun, C. SO, The University of Hong Kong, Hong Kong, HONG KONGC.E. Walker, National Optical Astronomy Observatory, Tucson, Arizona, UNITED STATES


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