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    He stands next to a river with his two dogs while fighting a bull and he can help you tell how bad light pollution is in your area. How?

    Question #101348. Asked by edmund80. (Nov 29 08 10:57 PM)


    looney_tunes

    		The constellation of Orion is standing next to the river Eridanus with his two hunting dogs Canis Major and Canis Minor, fighting Taurus the bull.
    http://en.wikipedia.org/wiki/Orion_(constellation)

    The clarity with which these stars can be seen can be used as a measure of light pollution (more specifically, skyglow) in a given area.

    http://en.wikipedia.org/wiki/Light_pollution

    Nov 29 08, 11:48 PM
    edmund80

    		Yes, and specifically counting the stars in the constellation Orion can help tell just how intense light pollution is in your area.

    "To find out how well your sky fares, count the stars in Orion on a clear and moonless night—a method professional astronomers recommend to estimate sky brightness. Above major cities, the constellation shows about 11 stars. But far enough away from light pollution, at least 50 should be visible."

    http://ngm.nationalgeographic.com/2008/11/light-pollution/follow-up-text

    Nov 30 08, 12:10 AM

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