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Globe at Night

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 to a website from a computer or smart phone.

Clear Sky Chart

Astronomers forecast showing at a glance when, in the next 48 hours, we might expect clear and dark skies for one specific observing site.

NASA Blue Marble Navigator

Satellite maps of Earth showing how bad light pollution is where you live and around the world.

Light Pollution Map


Map of lighting on Earth with overlays using data from 2010, 2014, 2015, and 2016, as well as user SQM data.

Dark Sky Map

Discover and share the best places to observe the night sky, powered by our community.

Go Stargazing

Skyglow (U.K.)

An interactive infographic investigating the growth and change of light pollution in Britain. Learn basic facts about outdoor light usage in the U.K. and watch the evolution of historic and forecasted trends in light pollution from 1992 through 2025. Commissioned by Hillarys, the United Kingdom’s leading supplier of made-to-measure window dressings and sponsor of the UNESCO International Year of Light (2015).