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, 2017 campaign!

So far in 2017 citizen scientists from around the world have contributed 8,995 data points. We are just getting started - help us make it a record setting year!

Campaign dates & Constellations for 2017 have been announced!

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 2017.

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Globe at Night and SciStarter

SciStarter has been working closely with Globe at Night to integrate some of their new NSF-funded SciStarter 2.0 tools onto their site. These tools allow participants to automatically track their contributions through a centralized SciStarter dashboard. Check out our project page to learn more.

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 2017 a record year!

Did you know?

Citizen scientists in 97 countries participated in Globe at Night, submitting their data in 18 different languages (other than English) in 2016! Find out more interesting information about this year’s campaigns from the Globe at Night Interactive Infographic for 2017!

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 & iOS (iPhones an iPads). And if you have an iPhone 4S or later, take a look at the Dark Sky Meter app, just 99¢ in the App Store.

Globe at Night & STARS4ALL

Globe at Night has been accepted as part of the STARS4ALL Light Pollution Initiatives.

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.