Dark Sky Survey
Global Citizen Science
Join scientists worldwide in measuring the darkness of our skies. Every observation helps track how light pollution changes over time.
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NELM Survey
Naked-Eye Limiting Magnitude. Count stars with your eyes — no equipment needed.
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SQM/SQM-L Survey
Sky Quality Meter. Use a SQM or SQM-L meter to measure sky brightness in mag arcsec⁻².
Your observations contribute to long-term dark sky research. Data is stored anonymously and helps scientists understand light pollution trends.
