About Globe at Night

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 our “right to starlight”, but can affect energy consumption, wildlife and health. More than 200,000 measurements have been contributed from people in 180 countries over the last 14 years, making Globe at Night the most successful light pollution awareness campaign to date!

Explore the last 14 years of data in our interactive data map, or see how your city did with our regional map generator. The Globe at Night website is easy to use, comprehensive and holds an abundance of background information. 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 2020

For 2020 we are collecting your observations during all 12 months of the year! See the dates below and plan to get involved.

2019 Results Summary

Global map plotting all the data points from the 2019 Globe at Night campaigns

The Preliminary 2019 Results are in: there were just over 10,000 data points submitted from 71 countries and 50 US States. Explore the 2019 data in our interactive infographic.