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 May, 2021 campaign!

This year we're off to a great start with 16,788 observations already submitted. Help us reach our goal of 20,000 data points for 2021!

Check out the campaign dates & constellations for 2021!

Can you find Bootes?

To find Bootes, look for the Big Dipper constellation in the north. Follow the arc made by the Dipper's handle until you see a bright star. This is Arcturus, which is located in what would be the waist of Bootes. The rest of the stars in Bootes form the shape of a kite, with dimmer stars beneath the diamond shape of the kite forming his legs.

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

The May 2021 campaign is using the Constellation Bootes. 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!

Globe at Night in April

Citizen Science Month (jointly done with SciStarter) offers thousands of opportunities for you to turn your curiosity into impact. There’s something for everyone, everywhere! Join a project or event from wherever you are to help scientists answer questions they cannot answer without you. Besides the Globe at Night campaign in April, Globe at Night is presenting on:

Inspired by the 100 hours of astronomy, this annual festival, Global Astronomy Month has been a flagship program of Astronomers without Borders for more than a decade. A mix of various programs ranging from Astro Arts to Observational Programs, this festival runs the whole month of April and features partners and that creates a larger community of astronomy enthusiasts that span the globe. like Globe at Night.

Join International Dark-Sky Week (April 5-12) to learn about the dark sky movement and discover the night where you live! The dark sky movement is working to bring better lighting to communities around the world so that all life can thrive. It may seem harmless, but light pollution has far-reaching consequences that can be harmful to all living things. Effective outdoor lighting reduces light pollution, leading to a better quality of life for us all.

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

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!

Turn on the Night: A Light and the Environment STEM Kit

New! A light pollution education kit: Turn on the Night!

Based on the Quality Lighting Teaching Kit developed by the National Optical Astronomy Observatory for the International Year of Light, 2015, Turn on the Night, a Light and the Environment STEM Kit is available now at Laser Classroom.

Four hands-on activities invite students in grades 7-12 to plan, design and create strategies for city lighting that balance the competing concerns of humans and the environment. Using the problem solving process, students learn about issues raised by human created lighting: Glare, Sky Glow, Light Trespass and Excess Energy Consumption. Come find out more at:

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.

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.