Measure and monitor the quality of the night the sky with the Sky Quality Meter whether you are an astrophotographer, astronomer, researcher, or just want to know how bright the lights are in your community
Even one candle seen from a mile away is brighter than each of the stars in the Big Dipper, so very small amounts of stray light can impact natural lightscapes.
Find the model that fits your needs.
Frequently asked questions about the Sky Meter
Lighting and Astronomy from Physics Today
Lighting for Reassurance & Safety presentation by Nancy Clanton of Clanton Associates and Alan Laird Lewis, Consultant in Physiological Optics
Dr Peter Plavchan, Director of George Mason’s Observatory explains How bright is a 100 lumen LED lightbulb vs Moonlight in this video.
Bulletin board of dark sky and artificial light at night information.
Become a citizen scientist. Participate in the Globe at Night Program Globe at Night Report App
Go Astronomy Dark Sky Sites Nighttime Satellite Map & Light Pollution Map