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 May, 2016 campaign!

This year citizen scientists from around the world have contributed 7,883 data points. Help us make 2016 a record setting year!

Campaign dates & Constellations for 2016!

Can you find Leo?

Once you have found Leo, you will be able to see why the ancients visualized this asterism as a lion and you will find it very easy to spot in the night sky. However, if you have never had anyone point out this constellation, looking for Leo can be very much like trying to spot a lion hiding in the grasslands of the African Savannah.

Much like any time you are looking for something new, it is usually easier to start with something you already know. In the case of the night sky, one of the most recognizable constellations is that of the Big Dipper. Look for it in the North. You can trace it’s curved handle to the four stars that make up the bowl of the dipper. The two stars that delineate the far side of the bowl are often called pointer stars. If you follow them to the North, they point right at the North Star (Polaris), which also happens to be the first star in the handle of the Little Dipper. Following the pointer stars to the South will point you right to Leo.

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

The current campaign is using the Constellation Leo. 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

The May 2016 campaign is coming! 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 available for Android & iPhones. And if you have an iPhone 4S or later, take a look at the IYL version of the Dark Sky Meter app. Both are free downloads!

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.