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 to a website from a computer or smart phone. It's easy to get involved - just follow these 5 Simple Steps!

Image courtesy Babak A. Tafreshi

Join the April, 2014 campaign!

Citizen scientists from around the world have contributed 10028 data points so far this year - thank you! Read more about the first campaign in our Globe at Night Newsletter.

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 2014.

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Globe at Night in the News!

Globe at Night webapp

The fourth campaign of 2014 has begun! Whether you use a smartphone, tablet or computer, get ready to submit your data in real time with our webapp! Now available in 26 languages.

Resources for 2014

Globe at Night is truly an international campaign, providing Activity Guides, Postcards, and the data reporting webapp in more than 20 languages. These are all available to download from our Resources page.

What is Light Pollution?

Too much light pollution has consequences: it washes out starlight in the night sky, interferes with astronomical research, disrupts ecosystems, has adverse health effects and wastes energy. Learn more...

Related phone apps

Globe at Night is pleased that two native smartphone apps have become available that integrate well with our campaigns. If you have an Android phone, check out the Loss of the Night app. And if you have an iPhone 4S or later, take a look at the Dark Sky Meter app.

See how your region is doing in 2014 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.