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 February, 2020 campaign!

In 2019 citizen scientists from around the world contributed 10,181 data points! Help us achieve our goal of 15,000 data points in 2020!

Check out the Campaign dates & Constellations for 2020!

Can you find Gemini?

Locate the two brightest stars in Orion. Then head northeast from the two brightest stars in Orion about the same distance as the separation between the two brightest stars in Orion. Pollux will be among the brightest star in the sky after Capella and a couple of other stars. Then Castor and Pollux are about two-fingers-together-at-arm’s-length apart from each other. After finding these two stars, the rest of the constellation completes a rectangle toward Orion.

If you are located at a latitude of less than 40°, you will also have the option of using Orion for the February Globe at Night campaign.

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

The February 2020 campaign is using the Constellation Gemini. Check out the dates and constellations for our other campaigns during all 12 months of 2020.

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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 2020 a record year!

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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 2020 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: https://mailchi.mp/laserclassroom.com/turnonthenight.


Globe at Night and SciStarter

Globe at Night is proud to be one of SciStarter's Top Ten Projects of 2018! 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.