About
Globe at Night is a globally recognized citizen-science campaign run by astronomers and educators to combat light pollution by empowering everyday people to become night sky observers. Participants are invited to identify specific constellations — such as Leo, Boötes, Crux, and others — compare them against magnitude charts, and submit their sky brightness observations online. These crowd-sourced data points are aggregated into interactive maps that visualize light pollution levels across the globe. The platform provides rich educational content including constellation guides, magnitude reference charts, and resources aligned to educational standards, making it ideal for schools, astronomy clubs, and individual science enthusiasts. A dedicated 'Dark Skies Rangers' program engages younger audiences in active sky monitoring campaigns organized throughout the year. Data collected through Globe at Night contributes to meaningful scientific research, helping scientists and policymakers track the spread of artificial light and its effects on ecosystems, human health, and astronomical observation. The interactive data map allows users to explore historical observations, compare regional sky brightness, and understand trends over time. Globe at Night is completely free to use and requires no special equipment — just your eyes, a clear sky, and a willingness to contribute to global science. It is suitable for students, educators, amateur astronomers, and anyone passionate about preserving dark skies for future generations.
Key Features
- Night Sky Observations: Participants identify constellations and compare them to magnitude charts to report local sky brightness from anywhere in the world.
- Interactive Data Map: An interactive global map displays crowd-sourced sky brightness observations, allowing users to explore and compare light pollution data by region.
- Educational Resources: Comprehensive learning materials including constellation guides, magnitude charts, and curriculum-aligned resources for educators and students.
- Yearly Observation Campaigns: Organized campaigns throughout the year encourage participants to observe specific constellations during optimal viewing windows.
- Dark Skies Rangers Program: A dedicated program that engages younger audiences and school groups in structured dark sky monitoring and awareness activities.
Use Cases
- Science teachers incorporating citizen science and astronomy into middle or high school curricula using Globe at Night's educational standards-aligned resources.
- Amateur astronomers and stargazing enthusiasts documenting and monitoring light pollution changes in their local area over time.
- Environmental advocates and policymakers using Globe at Night data to support dark sky preservation initiatives and municipal lighting regulations.
- University research groups collecting community-generated sky brightness data to supplement professional light pollution studies.
- Youth science clubs and ranger programs completing structured night sky observation projects as part of environmental education activities.
Pros
- Completely Free: No cost, no registration barriers — anyone can participate and contribute to global light pollution research.
- No Special Equipment Needed: Observations require only the naked eye and a clear sky, making participation accessible to people of all ages and backgrounds.
- Real Scientific Impact: Data submitted by citizen scientists contributes directly to peer-reviewed research and helps policymakers address light pollution issues.
- Strong Educational Value: Standards-aligned materials make it easy for teachers to integrate night sky observation into science curricula.
Cons
- Weather Dependent: Observations can only be submitted on clear nights, making participation unreliable in regions with frequent cloud cover.
- Limited to Designated Campaigns: Observation windows are tied to specific constellation campaigns during the year, which may not align with every user's schedule.
- No Mobile App: Globe at Night operates primarily through its website, lacking a dedicated mobile app that could simplify on-the-spot data submission outdoors.
Frequently Asked Questions
What is Globe at Night?
Globe at Night is an international citizen-science campaign that invites people to measure and report their local night sky brightness to help track and raise awareness about global light pollution.
How do I participate?
Find a designated constellation for the current campaign, compare it to the provided magnitude charts to estimate sky brightness, and submit your observation through the Globe at Night website.
Is Globe at Night free to use?
Yes, Globe at Night is completely free. No special equipment, membership, or payment is required to participate or access the data.
What constellations are used for observations?
Campaigns rotate through constellations visible from different hemispheres, including Leo and Boötes (northern hemisphere) and Crux/Southern Cross (southern hemisphere), among others.
What happens to the data I submit?
Your submitted data is added to a global database, visualized on an interactive map, and used by scientists and researchers to study light pollution trends and their environmental and health impacts.
