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 Babak Tafreshi

Join us for the December, 2018 campaign!

So far in 2018 citizen scientists from around the world have contributed 7,311 data points! Help us achieve our goal of 15,000 data points this year!

Check out the Campaign dates & Constellations for 2018!

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 December 2018 campaign is using the Constellation Perseus. Check out the dates and constellations for our other campaigns during all 12 months of 2018.

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How you can make a difference by participating in Globe at Night and why...

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!

Calling all Girl Scouts!

SciStarter and Girl Scouts of the USA are teaming up with Globe at Night and six other citizen science projects to encourage girls to pursue STEM (science, technology, engineering, and math) by adding 23 new badges through the new “Think Like a Citizen Scientist” program.

Globe at Night and SciStarter

Globe at Night is proud to be one of SciStarter's Top Ten Projects of 2017! Register with SciStarter to take advantage of their tools to automatically track your contributions through a centralized SciStarter dashboard. Check out our project page to learn more.

Globe at Night & STARS4ALL

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

Related phone app

The Loss of the Night app is a free app available for both Android & iOS (iPhones an iPads). This app integrates well with the Globe at Night program.

Did you know?

Citizen scientists in 106 countries participated in Globe at Night, submitting their data in 20 different languages (other than English), with 57% of them using a mobile device in 2017! Find out more interesting information about this year’s campaigns from the Globe at Night Interactive Infographic for 2018!

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.