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Saving Dark Skies


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

Two types of antique street light fixtures
A primer on light-pollution jargon

Harsh lights in residential neighborhood
How to light your home safely, save energy, and decrease light polluion at the same time.

Two light shields
You don't have to search to the ends of the Earth to find exterior residential lighting that's dark-sky friendly.

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

Wall Pack versus Shoe Box fixture
Information on good and bad lighting fixtures

An unshielded light dazzles the eye and hides the author.
You don't have to fight city hall. To ban bad lights, make city hall your friend.

Washed out Orion seen behind bright street light
Only a tiny fraction of astronomers do anything to help reduce bad outdoor lighting. We need to change that.

Earth at night as seen from space
In the last two generations, light pollution has spread from a problem in cities to a major astronomical disruption almost everywhere.

Winter constellations seen in a class 4 or 5 sky
Excellent? Typical? Urban? Use this nine-step scale to rate the sky conditions at any observing site.

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

Jennifer Barlow
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.



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