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Lessons from the Retrofit Revolution

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A recent news article draws attention to a new street lighting project just completed in downtown Philadelphia, Pennsylvania. This retrofit included replacing hundreds of high-pressure sodium lights with new, more energy-efficient, white LEDs. Philadelphia officials had good intentions in deploying… Read More

Night Sky Data to the People!

A satellite image of Berlin at night showing the difference between the lights of west and east Berlin.

New Citizen Science Project Lets Anyone Analyze Night Sky Brightness Data As streetlights the world over change from sodium lamps to LED, scientists wonder what this means for night skies. Because all cities don’t light the… Read More

Clouds and Aurora in a Natural Setting

Dark clouds with the aurora borealis lighting up the sky in gree, purple and orange over Glacier National Park in Montana, U.S.

By Guest Author Chris Kyba Ray Stinson recently shared these beautiful images of aurora and clouds with me. They were taken in Glacier National Park in Montana, U.S. The orange glow at the horizon in some… Read More

Help measure how the night sky is changing

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By Guest Author Chris Kyba On Saturday, September 12 2015, you can join thousands of people around the world in measuring how bright the night sky is where you live. The results from this experiment… Read More

Mapping Earth’s Night One Picture at a Time

NASA nighttime satellite photo of East and West Berlin, Germany, showing the difference in lighting.

Cities at Night is a citizen science project that invites the public to help analyze nighttime images taken from the International Space Station. This valuable information helps researchers better assess light pollution across the globe… Read More

Journal Provides Free Access to its Theme Issue on Artificial Light at Night

A NASA nighttime satellite image of the City of Paris showing a lot of light pollution.

  The academic journal Philosophical Transactions B is allowing free access through September to all articles published in its themed issue “The biological impacts of artificial light at night: from molecules to communities.” The biological… Read More

Rediscovering the Night Sky in Middle Age

Stars and the Milky Way above a hillside of Saguaro cactus east of Peridot, Arizona.

By Guest Writer Suzanne Wright Before moving to Arizona, I lived my entire adult life in the bright lights of urban big cities: Atlanta, Chicago, Washington, D.C. For the past 20 years, a street light… Read More

Join Us for Our Google+ Hangout “Light Pollution’s Effect on Wildlife”

Owl sitting on a branch.

As part of the International Year of Light Cosmic Light theme, IDA has been holding Google Hangouts with world-renown experts on light pollution issues. Join us live for the fourth in our series, “Light Pollution’s Effect… Read More

Planning Our Nights

A nighttime satellite image of Florida showing excessive lighting that creates skyglow.

Florida Planning magazine (published by the American Planning Association Florida Chapter) features a great article about protecting the night from a conservation planning perspective. The piece was written by IDA Board Member and Florida chapter… Read More

Light Pollution Researchers Gather In Québec

Conference Attendees Gather and Talk Before the Meeting Starts

Light pollution researchers from around the world met at Jouvence, Québec, Canada from 26-28 May 2015 for the second biennial Light Pollution Theory, Modeling and Measurements (LPTMM) conference. Speakers at the meeting agreed that while our… Read More