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 Sergio Garcia Rill

Join us for the December, 2014 campaign!

Citizen scientists from around the world have contributed 18,418 data points so far this year - thank you! Read more in our Globe at Night Newsletter.

The campaign dates have been announced for 2015!

Can You Find Perseus?

Perseus the slayer of Cetus is most easily seen rising in the East in the winter. The constellation is most easily identifiable as what almost appears to be a wishbone of brightest stars, with the brightest being the center and chest of Perseus. The legs of Perseus are pointing southward and are the forked part of the wishbone and the body and head are the straight line leading up northward. It is easy to find Perseus by either looking southward from Cassiopeia or just to the left of Taurus the Bull.

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

The current campaign is using the Constellation Perseus. 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 final campaign of 2014 is here! Whether you use a smartphone, tablet or computer, you can submit your data in real time with our webapp! Now available in 26 languages. Help us reach 20,000 observations for 2014!

Did you know?

That about ⅓ of Globe at Night data has been submitted with a mobile device this year? Our partnership with the makers of two mobile apps has greatly boosted the mobile numbers, but even without those data points, the number of people using the web app with a mobile device continues to climb each year. Find out more interesting information about this year's campaigns from our new Globe at Night Interactive Infographic!

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.

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 has been updated with improved feedback, more customization options, more accurate measurements, and more. And now it is available for iPhones! 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.