1–20 of 23 results
a child outside at night catching fireflies with a net

Astronomy and Society

Photographers “Capture the Dark” with Stunning Images of the Night

Stunning images of the night remind us why we need to protect dark skies. See the photos that won the International Dark-sky Association's contest.

Explore the Night with Bob King

How Dark Is Your Night Sky?

Traditional and digital tools can help you learn the naked-eye magnitude limit of your sky and find out if the darkness has changed at your observing site.

Light Pollution Map - Canary Islands

Save Dark Skies

Starry Success: Protecting the Night Sky Above La Palma

Ten years ago, La Palma was declared a "Starlight Reserve" and measures were implemented to protect its skies from light pollution. How did they work?

Astronomy and Society

Measuring the Impacts of Light Pollution

Light pollution is pervasive, and its impact on people is larger than you might think.

Milky Way from Arches National Park

Save Dark Skies

It's International Dark-Sky Week!

What began as a student's simple idea a decade ago has grown into a worldwide celebration of the night sky and easy ways to reduce light pollution.

Canyonlands National Park at night

Astronomy and Stargazing Projects

Help Keep Our Skies Dark — Join IDA Today

It's high time that we amateur astronomers got serious about protecting the night sky from light pollution.

Measuring skyglow in Arizona

Save Dark Skies

Rate the Darkness of Your Sky

A new website shows how light pollution spreads around the globe — using data gathered by its users.

Cheney in Times Square

Save Dark Skies

AMA Addresses Light Pollution

The American Medical Association has released a report detailing several possible health concerns related to nighttime light exposure. But some lighting researchers worry the conclusions are more alarmist than is warranted.

Mario Motta

Save Dark Skies

U.S. Physicians Join Light-Pollution Fight

Thanks to a full-court press by a cardiologist with a passion for astronomy, the American Medical Association has taken a stance in the fight to make outdoor lighting more benign to humans — and to the stars above.

Save Dark Skies

Rate Your Skyglow

Light pollution is most amateur astronomers' worst enemy. Learn here how to measure and describe how brightly your sky glows.


Astronomy and Stargazing Projects

111 Deep Sky Wonders for Light-Polluted Skies

Bright skies aren't empty skies. See for yourself how many treasures lie hidden in the glow of a city sky.

Save Dark Skies

Good-Neighbor Outdoor Lighting (Flyer)

This flyer (which can also be printed as a PDF) tells you everything you and your neighbors need to know about how to address light pollution in your neighborhood.

Two types of antique street light fixtures

Save Dark Skies

Lighting 101

A primer on light-pollution jargon

Harsh lights in residential neighborhood

Save Dark Skies

Your Home Lighting Guide

How to light your home safely, save energy, and decrease light polluion at the same time.

Bright street light at night in winter

Save Dark Skies

Bright Lights, Big Problems

In the war against light pollution astronomers have gained important new allies -- and new insights into how we see at night.

Save Dark Skies

How I Beat Light Pollution in My Hometown

You don't have to fight city hall. To ban bad lights, make city hall your friend.

Save Dark Skies

Jennifer Barlow: Dark-sky Devotee

One person can make a difference, as demonstrated by a high-school student's single-handed effort to help us all appreciate the night sky.

Two light shields

Save Dark Skies

Home Lighting Guide

Here's how to find exterior residential lighting that's dark-sky friendly.

Save Dark Skies

Good Lighting Fixtures: Where to Get Them

Here's a selection of manufacturers and suppliers of good lighting equipment.

Winter constellations seen in a class 4 or 5 sky

Save Dark Skies

Gauging Light Pollution: The Bortle Dark-Sky Scale

Excellent? Typical? Urban? Use this nine-step scale to rate the sky conditions at any observing site.