Measuring Light Pollution

Introduction

Light pollution is an often-overlooked issue that affects people, wildlife, and our ability to see the stars. In this activity, Scouts will use the Globe at Night website to measure and report light pollution in their area. By observing the night sky and submitting data, Scouts contribute to global research on light pollution and its effects.

What you'll need

• A clear night sky (preferably with no moon)
• Internet-connected device (smartphone, tablet, or laptop)
• Star chart (optional for reference)
• Torch or headlamp (with red filter to protect night vision)
• Notebook or phone for additional observations

Activity

• Prepare for Observation:

  • Find a dark location with minimal artificial light
  • Let your eyes adjust to the darkness for 10 minutes before starting

• Observe & Record Data:

  • Visit the Globe at Night website: https://www.globeatnight.org/webapp/
  • Input your location and time of observation
  • Choose the star chart that best matches what you see in the sky
  • Identify the faintest star visible in your chosen constellation
  • Record the amount of cloud cover at the time of observation
  • Submit your data by clicking “SUBMIT DATA”

Change the challenge level

Easier:

• Pair younger Sections with older Sections to help navigate the website
• Use a printed star chart instead of the online version for comparison
• Focus on counting the stars they can see rather than submitting data

Harder:

• Conduct observations from multiple locations (urban vs. rural) to compare results
• Research solutions to light pollution and create a plan to reduce light pollution at the Scout Hall
• Track data over multiple nights to see how cloud cover, location, and moon phase impact visibility

Reflection