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Journal Article

THE EFFECTS OF URBAN LIGHTING ON THE BRIGHTNESS OF THE NIGHT SKY

MERLE F. WALKER
Publications of the Astronomical Society of the Pacific
Vol. 89, No. 529 (June 1977), pp. 405-409
Stable URL: http://www.jstor.org/stable/40677041
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
THE EFFECTS OF URBAN LIGHTING ON THE BRIGHTNESS OF THE NIGHT SKY
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Abstract

A new study of urban lighting and its effect on the brightness of the night sky indicates: (1) The total light output of cities of similar economic development is at least approximately proportional to their populations. (2) The artificial illumination of the night sky at 45 ° altitude in the direction of the illuminating city varies as I∝ D¯²⁵ .(3) The distance at which cities of a given population produce a brightening of the sky of 0.2 magnitude at 45° altitude toward the city varies as P∝ D2.5 .

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