The related subject of dark-adaptation (as far as I know, these are not (Reidel, 1973), which outlines the hard science of the matter with a refreshingĪnd while we're at it, I may as well mention primary sources of data about Is the marvelous little book by Roach and Gordon, "The Light of the Night Sky" Luginbuhl at USNO-Flagstaff has a program to do theseĪnother first-rate source of information about the night sky in general I might mention that light-pollution guru Chris Interest to have values calculated for Riverside, Stellafane, Astrofest, and Jockeys should add this feature to your programs! It would certainly be of Radius of the city itself), and the altitude of the site. Near a site of interest (and if the cities are physically large, also the The required inputs are radii to and populations of towns Includes some "hairy integrals", but are quite amenable to being coded into a Highly accurate predictions of sky brightness for any site. In these articles you will find the equations that allow you to compute & Astrophys., volume 27, page 19.Īll three can be obtained on-line via at: the ADS article service Results are most fully developed in the following publications: Viewpoint is Roy Garstang of the University of Colorado at Boulder. The only person who hasīothered to pursue the problem of night-sky brightness from an analytical Indeed I do, and also can supply someįacts, which have been in short supply in this thread. Steve Mencinsky has suggested that I might have opinions about comparative He has recently re-edited and updated the material and graciously granted permission to post it here. The following material was posted to the newsgroup in 19 by Brian Skiff, of Lowell Observatory. What color, if any, does the dark night sky have? How do factors such as man-made light pollution, natural air glow and light from interplanetary dust affect the darkness of the night sky? What about elevation, transparency and atmospheric particles? With growing light pollution we wonder how far do we have to travel to reach "dark" skies, and how much farther do we have to go to reach really dark skies? The darkness, or brightness, of the night sky is a topic of interest to all amateur astronomers and astrophotographers. "When darkness is at its darkest, that is the beginning of all light." The Brightness of the Night Sky Introduction
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