1–20 of 22 results

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

Saving Dark Skies - How to Help

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

Saving Dark Skies - How to Help

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

Astronomy and Society

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

Astronomy and Society

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

Saving Dark Skies - How to Help

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.

Saving Dark Skies - How to Help

Rate Your Skyglow

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


Saving Dark Skies - How to Help

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.

Saving Dark Skies - How to Help

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

Saving Dark Skies - How to Help

Lighting 101

A primer on light-pollution jargon

Harsh lights in residential neighborhood

Saving Dark Skies - How to Help

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

Saving Dark Skies - How to Help

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.

Saving Dark Skies - How to Help

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.

Two light shields

Saving Dark Skies - How to Help

Home Lighting Guide

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

Saving Dark Skies - How to Help

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.

Saving Dark Skies - How to Help

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

Saving Dark Skies - How to Help

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.

Saving Dark Skies - How to Help

Join the Fight Against Light Pollution

Only a tiny fraction of amateur astronomers do anything to help reduce bad outdoor lighting. We need to change that.