Globe at Night is an international citizen-science campaign to raise public awareness of the impact of light pollution by inviting citizen-scientists to measure & submit their night sky brightness observations. It's easy to get involved - all you need is computer or smart phone & follow these 5 Simple Steps!

Image courtesy Sergio Montúfar

Join us for the October, 2016 campaign!

This year citizen scientists from around the world have contributed 12,310 data points. Help us make 2016 a record setting year!

Campaign dates for 2017 have been announced!

Can You Find Cygnus?

Cygnus the Swan is easy to find as it flies south along the path of the Milky Way. It is easiest to spot by looking straight up and looking for the three brightest stars forming what is known as the Summer Triangle. The bright star in the lower left of this triangle is Deneb, the tail of the swan. By using this star and looking in toward the center of the triangle, you can now spot Cygnus.

Practice finding all the Globe at Night Constellations or review the Magnitude Charts.

The current campaign is using the Constellation Cygnus. Check out the dates and constellations for our other campaigns during all 12 months of 2016.

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Globe at Night in the News!

Globe at Night webapp

Whether you use a smartphone, tablet or computer, you can submit your data in real time with our webapp - now available in 28 languages! Help us make 2016 a record year!


Ever wonder what happens to your Globe at Night measurements? Scientists and citizen-scientists are using them in a variety of projects, most of which need multiple data points at the same location over time. This map shows 5,000 locations on Earth where an observation has been made but there hasn’t been a new one in the last five years. Do you or a friend live near one of these points? Help us out by making an observation there! And while you are at it, take a measurement where none have been taken yet! (See the map for 2015 and zoom in to your location to see where data was taken in 2015.)

Did you know?

That citizen scientists in 104 countries participated in Globe at Night in 2015? And they submitted their data in 23 different languages (other than English)! Find out more interesting information about this year's campaigns from the Globe at Night Interactive Infographic for 2016!

Related phone apps

Globe at Night is pleased that two native smartphone apps have become available that integrate well with our campaigns. The Loss of the Night app is a free app. available for Android & iPhones. And if you have an iPhone 4S or later, take a look at the Dark Sky Meter app, just 99¢ in the App Store.

See how your region is doing this year below. If you don't see very many data points, consider going outside tonight and contributing your own! Compare to other regions or previous years with our regional map generator.