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 6 Simple Steps!

Image courtesy NSF’s NOIRLab

Join us for the July, 2021 campaign!

This year we're off to a great start with 18,854 observations already submitted. Help us reach our goal of 25,000 data points for 2021!

Check out the campaign dates & constellations for 2021!

Can you find Hercules?

Hercules the hero of Greece can be best seen by looking up and to the North in the summer. Find the brightest star Vega by looking North, then by looking just west of that you can make out the keystone, or body, of Hercules. The head of Hercules will be to the South, and his kneeling legs will be pointing northward.

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

The July 2021 campaign is using the Constellation Hercules. Check out the dates and constellations for our other campaigns during all 12 months of 2021.

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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 2021 a record year!

For Libraries

SciStarter and Arizona State University created a customizable citizen science kit with everything needed for patrons to engage in Globe at Night. Access all the materials and details at SciStarter.org/Library-Resources


Globe at Night and SciStarter

Globe at Night is proud to be one of SciStarter's Top 20 Projects of 2020! 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’s “Adopt-a-Street” program

Are you passionate about Dark Skies? Consider coordinating an Adopt-a-Street program in your area during the 2021 Globe at Night campaigns.

What is the Adopt-a-Street Program?
Globe at Night offers a “Call to Action” for those who want to take more measurements during the campaigns. Children and adults can “Adopt a Street” in their town to take visual and possibly sky-brightness meter measurements during the Globe at Night campaigns. The strategy is for people to adopt a different major or semi-major street and take measurements every mile or so for the length of the street (or for as long as they can). The grid of measurements will canvas the town, allowing for research later in comparison to wildlife, health, energy consumption and cost, among other things.

Sign up to be an Adopt-a-Street coordinator for your city!

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. And if you have an iPhone that can run iOS 10 or later, take a look at the Dark Sky Meter app, just $1.99 in the App Store.

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.