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Tucson, Arizona, U.S. Skyglow Reduced 7% after Street Light Conversion

Tucson, Arizona, U.S. Skyglow Reduced 7% after Street Light Conversion Thumbnail

John Barentine, Director of Conservation at the International Dark-Sky Association, is the lead author of a recent study published online by the Journal of Quantitative Spectroscopy and Radiative Transfer. Although Barentine has previously published papers… Read More

Harvard Law School Student Studies Light Pollution Case Law for IDA

Harvard Law School Student Studies Light Pollution Case Law for IDA Thumbnail

Tucson, AZ — Harvard Law School student, Iris Zhou, performed a three-week internship at IDA Headquarters in Tucson, Arizona where she researched case law related to light pollution. As a part of her internship, Zhou… Read More

West Nile Virus Infectious Longer in Birds Exposed to Artificial Light at Night

West Nile Virus Infectious Longer in Birds Exposed to Artificial Light at Night Thumbnail

Artificial light at night doesn’t just affect our ability to see the stars — it also impacts complex ecological interactions and disease transmission factors, with the potential to have profound effects on human health.   What… Read More

Five Years of Satellite Images Show Global Light Pollution Increasing at a Rate of Two Percent Per Year

Five Years of Satellite Images Show Global Light Pollution Increasing at a Rate of Two Percent Per Year Thumbnail

Five years of advanced satellite images show that there is more artificial light at night across the globe, and that light at night is getting brighter. The rate of growth is approximately two percent each… Read More

Bird Migration Dramatically Altered by High-intensity Urban Light Installation

Bird Migration Dramatically Altered by High-intensity Urban Light Installation Thumbnail

By: Meg Schader for the International Dark-Sky Association Tribute in Light in New York City projects two beams of light into the sky as an annual memorial to the victims of 9/11. The tribute also… Read More

Nobel Prize Awarded for Discovery of Molecular Mechanisms Controlling the Circadian Rhythm

Nobel Prize Awarded for Discovery of Molecular Mechanisms Controlling the Circadian Rhythm Thumbnail

The Nobel Assembly at Karolinska Institute today announced the 2017 Nobel Prize in Physiology or Medicine is awarded jointly to Jeffrey C. Hall, Michael Rosbash and Michael W. Young “for their discoveries of molecular mechanisms… Read More

Be a citizen-scientist: measure the darkness of a total solar eclipsed sky!

Be a citizen-scientist: measure the darkness of a total solar eclipsed sky! Thumbnail

If you are on or near the centerline of the path of totality during the solar eclipse on August 21, 2017, you are able to participate in an activity to observe and record the faintest stars visible as a… Read More

Lights at Night Turn Nocturnal Pollinators Off

Lights at Night Turn Nocturnal Pollinators Off Thumbnail

Pollination is essential for the reproduction of many plant species. Some flowering plants rely on the wind or water to spread their pollen, but most depend on animals for pollination. Insects like bees, moths, and… Read More

Like moths to a flame: National Moth Week, and how you can help our nighttime wildlife

Like moths to a flame: National Moth Week, and how you can help our nighttime wildlife Thumbnail

Next week, as night falls, people across the USA and around the world will be found huddled in groups, waiting, staring into bright light sources. This is not some strange cult or ritual; in fact… Read More

The Psychology of Dark Skies

An aerial photo of Sark, Channel Islands.

By Guest Writer Ada Blair I’ve been a regular visitor to the Isle of Sark since 2010 when a close friend of mine moved there. Sark, at only 5.5 square kilometres, is the smallest of the… Read More