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Great World Wide Star Count

Main Project Information
Presented By This project is brought to you by the National Earth Science Teachers Association and Windows to the Universe
Goal Measure light pollution around the globe.
Task Compare your view of certain constellations to sample images.
Where Global, anywhere on the planet

The Great World Wide Star Count is an international event that encourages learning in astronomy by inviting everyone to go outside, look skywards after dark, count the stars they see in certain constellations, and report what they see online. These observations are used to determine the amount and spread of light pollution worldwide.

Participating in the event is fun and easy! You can join thousands of other students, families and citizen scientists from around the world counting stars. Don't miss out!

How to Join

First download the Activity Guide in any of 13 languages from
Then follow these five simple steps (each of which has an accompanying online resource):
1. Determine which constellation to observe
2. Find that constellation at night an hour after sunset (about 7-9 pm local time)
3. Match your nighttime sky with one of our magnitude charts
4. Report what you see online
5. View results of this international event

Social Media
Required Gear

Computer and Internet access.

Ideal Age Group Elementary school (6 - 10 years), Middle school (11 - 13 years), High school (14 - 17 years), College, Graduate students, Adults, Families
Spend the Time outdoors
Type of Activity On a hike, At home, At the beach, On a walk, run, At school, At a science center, zoo or aquarium, At night, At sports stadiums
Media Mentions
and Publications
Tags Astronomy & Space, Light Pollution
Project Updated 05/23/2018