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Globe at Night Activity Guide

Created: 2014-03-26
Amee Hennig
Globe at Night logo

How much light pollution affects our vision of the night sky? This guided observational activity engages students taking part in a global citizen science campaign to determine how light pollution varies in a given location. Through the process students also learn how to gather data and assess the impact of light pollution.

  • Globe at Night Activity Packet (download it from: Globe at Night Website )
  • Something to write on
  • Something to write with
  • Red light to preserve night vision
  • Optional: Smart mobile device, GPS unit, or a topographic map to determine your latitude or longitude

To learn how light pollution impacts us by observation and comparing the measurements around the world.

Learning Objectives
  • To employ simple equipment and tools to gather data locally.
  • Compare the acquired data with other observers.
  • Assess the impact of light pollution locally and in neighbouring areas.
  • To describe the effects of light pollution and the importance of citizen science.

Light pollution

Light pollution is stray light emitted from poorly designed and aimed lighting installations. This happens mostly around urban centres, where city lights diminish the view of stars and planets. A satellite view at night shows light pollution as glowing regions around urban areas.

Citizen science

Citizen science is scientific research conducted, in whole or in part, by amateur or nonprofessional scientists, often by crowdsourcing and crowdfunding. Formally, citizen science has been defined as "the systematic collection and analysis of data; development of technology; testing of natural phenomena; and the dissemination of these activities by researchers on a primarily avocational basis". Citizen science is sometimes called "public participation in scientific research."

Full Description

Safety note

Be sure to wear suitable clothing for the weather and for being outside at night (light coloured and/or reflective clothing). If the engaged participants are children, they should be supervised by parents or teachers.


Step 1

Select one constellation at that is visible on the observing night of your location. Then use the webapp on Globe at Night website to help find your constellation in the night sky.

Step 2

Students need to determine the location and longitude of their observation area through one of the following methods;

  • use the webapp at With a smart phone or tablet, the latitude and longitude are automatically determined as one reports the observation. If a student is reporting it later from the computer, he or she has to input the address of observation or the city. Zoom in/out and pan around until the observation location is found. The latitude and longitude will be displayed.
  • entering the location into the webapp at
  • GPS unit for taking a measurement. Students should report as many decimal places as the unit provides.
  • topographic map of the observation area.

Step 3

Go outside more than an hour after sunset and be sure that the sky has darkened. The Moon should not be up. Let your eyes become used to the dark for 10 minutes before your first observation.

Step 4

Match your observation to one of 7 magnitude charts at and note the amount of cloud cover.

Step 5

Report the date, time, location (latitude/longitude), the chart you chose, and the amount of cloud cover at the time of observation at:

  • Ask students to compare their results with others in the group and determine the reasons for different observation results.
  • Ask students to compare their results with local and neighbouring areas and assess the impact of light pollution.
  • Discuss the importance of citizen science and how it impacts real science. Some points: apart from enabling and encouraging members of the public to get involved in and appreciate the value of science, citizen science contributes to real science, especially in the age of ‘big data’ where scientists collect a lot of data from their observations or experiments. Citizen science allows comparison to data from automatic data reduction (where this is possible) and to spot unusual things that scientists did not expect and would not be spotted by automated processes.

UK KS2: Year 5 Science - Earth and Space
UK GCSE Astronomy - Edexcel Topic 1.1d Planet Earth

Additional Information

Extend the activity further by making more observations from other locations. More observation helps to determine the light pollution around the world.

Compare your observation to thousands around the world on the interactive web map:

There are many other citizen science projects available for interested students to get involved in, such as Zooniverse, available at