Geometry.Net - Basic_L: Light Pollution

EMU Astro Club-Light Pollution
Erosion of the Night Sky from light pollution. Local Ordinance and State LegislationAddress light pollution. Brighton Township Ordinance No. 143.
http://www.physics.emich.edu/sherzer/lightpol.htm

Extractions: (click on image to enlarge) "I remember camping as a kid when we could see so many stars you couldn't tell one constellation from the next, and the Milky Way was a river of light". "It was so dark you could hardly see your hand in front of your face, and I saw my shadow on the ground from Venus!" The lucky ones among us have probably made these claims, but sights such as this are becoming increasingly rare. Only a generation ago, many could still see the Milky Way from their backyards. Unfortunately, the overuse and poor quality of modern outdoor lighting is fast destroying a valuable natural resource - a dark nighttime sky. The light pollution that results from this misuse is, however, the easiest of pollution sources to fix. Please read on.... turned off when not in use and the CPU energy star compliant) The Culprits: The next time you see the late evening news, notice the "tower camera" views TV stations often use. Then ask two simple questions: Why is the night sky orange instead of black? And, why are so many lights visible from the top of the building tower and from miles away? Generally, if you can see a fixture's light source from more than a hundred yards away, it's a bad fixture. Decades old designs such as cobra-style and
Light Pollution
Information about the problem in Croydon.
http://www.croydonastro.org.uk/lights.htm

Extractions: The Croydon Astronomical Society Light Pollution Campaigns to control light pollution The inquiry will have the following terms of reference: To examine the effectiveness of measures taken to reduce the impact of light pollution on astronomy and to consider what further steps, if any, are required. The Committee will consider the following specific questions: What has been the impact of light pollution on UK astronomy? Are current planning guidelines strong enough to protect against light pollution? Are planning guidelines being applied and enforced effectively? Is light measurable in such a way as to make legally enforceable regulatory controls feasible? Are further controls on the design of lighting necessary? The Committee would welcome written evidence from interested organisations and individuals addressing these points. Evidence should be submitted by Wednesday 30 April 2003. Oral evidence will be heard in May. Evidence should be sent in hard copy to the Clerk of the Science and Technology Committee, 7 Millbank, London SW1P 3JA. Please send an electronic version also, in Word format
RASC LPAP
RASC light pollution Abatement Program. TABLE OF CONTENTS. LPAP Program,Mission, Other Organisations. LPAC Committee, What we do, Definitions.
http://www.rasc.ca/light/home.html
RASC LPAP
Explains how the problem is and can be tackled in Canada with the LPAP. Contains helpful Canadian information.
http://www.rasc.ca/light/
RASC Light Pollution Abatement Program
PROGRAM The goal of the RASC light pollution Abatement Program (LPAP) is to reducethe levels of light pollution in urban and rural areas by advising Federal
http://www.rasc.ca/light/text.htm

Extractions: The goal of the RASC Light Pollution Abatement Program (LPAP) is to reduce the levels of light pollution in urban and rural areas by advising Federal, Provincial and Municipalities governments and departments, business and conserned citizens on Light Pollution Abatement (LPA). It is a constructive and advisory program that encourages meetings at the local level between concerned citizens and governments,business and the media to inform and advise these groups on the problems created by light pollution. We provide practical recommendations to reduce obtrusive lighting. The Program is managed by the NLPA Committee consisting of volunteers from across Canada. The NLPAC supports local initiatives with the distribution of information and presentation materials. These are in the form of printed booklets, information sheets and a slide set to complement a formal presentation on light pollution abatement. On the strategic national and regional level, the Committee recommends to Federal and Provincial governments the use of non-polluting exterior lighting designs and luminaires in projects under their jurisdiction. Further, the Committee advises governments as part of their infrastructure maintenance and renewal to replace older luminaires that produce glare and light trespass with luminaires with the full cut-off optics.
WebQuest
An educational inquiryoriented learning scheme for children to learn about the problem.
http://www.geocities.com/psxwoman/

Extractions: Introduction In the past ten years or so, the amount of light produced by artificial lighting has doubled. This over-lighting, called light pollution, has not only made observing objects in the night sky increasingly difficult for interested viewers, it has also presented a safety hazard due to how our eyes adjust to light. We will research how light pollution affects our lives, explore possible workable solutions to the problem, and determine ways to communicate what we have learned to others. Back to the top The Task Using the background information provided by this Web Quest and examples of city outdoor lighting ordinances, we will create a multi-media campaign to make the Geneva Lakes area aware of light pollution and the need for lighting restrictions. The following are critical questions that must be addressed in all phases of the multi-media campaign: What is light pollution?
ThinkQuest Library Of Entries
NEW ON JANUARY 5, 2000 Read more new comments on light pollution.Select a Topic Return to selection Comment light pollution.
http://library.thinkquest.org/3461/gallery.htm

Extractions: The web site you have requested, The Online Planetarium Show (TOPS) , is one of over 4000 student created entries in our Library. Before using our Library, please be sure that you have read and agreed to our To learn more about ThinkQuest. You can browse other ThinkQuest Library Entries To proceed to The Online Planetarium Show (TOPS) click here Back to the Previous Page The Site you have Requested ... click here to view this site Click image for the Site Awards Received Languages : Site Desciption View space as seen through the Hubble Telescope with the interactive planetarium program "Hubble from Here to Eternity." Take the guided tour or wander through the marvelous photos and information including planets, galaxies, black holes, and other phenomena in the universe. An excellent table of contents makes finding specific topics such as the biographies of astronomers or the mythology behind the stars easy. Also, there are many good links to other space sites.
Edmonton Area Light Pollution Awareness & Abatement - Homepage
Explanatory information, links, news, photographs, a mailing list, an incident report generator and personal stories from this region of Canada.
http://www.telusplanet.net/public/hgibbins/lighthome_english.htm

Extractions: La Societe Royale D'Astronomie du Canada Our Mission Statement Safeguarding access to the streets, and the Universe through responsible lighting. By paraphrasing our Mission statement: Our goal is to make citizens, companies, organizations, etc. aware that there is another form of pollution in the world - Light Pollution Last Revised: July 2, 2002
Light Pollution
WHAT IS IT? (140 Kb). The definition of light pollution. LIGHT FIXTURES (90 Kb) ADVANTAGES(10 Kb) Advantages and benefits of reduction light pollution.
http://www.iac.es/proyect/otpc/pollu.htm

Extractions: OFICINA TECNICA PARA LA PROTECCION DE LA CALIDAD DEL CIELO LIGHT POLLUTION In this page you can select the following subjects: WHAT IS IT? (140 Kb) The definition of light pollution. LIGHT FIXTURES (90 Kb) Several types of light fixtures, divided into fixtures that pollute the sky and fixtures that do not. BASIC CRITERIA (22 Kb) Grafic basic criteria in light fixtures. SPOTLIGHTS (30 Kb) The use of symmetric and asymmetric spotlight. LIGHT BULBS (35 Kb) Several types of light bulbs. ADAPTATIONS (200 Kb) Some adaptation in La Palma Island. ADVANTAGES (10 Kb) Advantages and benefits of reduction light pollution. If you wish to go back to previous menu push here. Last Updated: Lunes 9 de abril de 2001
AAS Committee On Light Pollution, Radio Interference And Space Debris
Includes information on this pioneering committee and what they do. Also includes lists of books, magazine articles and weblinks. Much of the information is outof-date.
http://www.aas.org/~light/
Light Pollution Awareness Community - Www.lightfromabove.org
Webbased public discussion forum on light pollution with articles and latest news.Category Society Issues light pollution Chats and Forumslight pollution Awareness Community where you can discuss light pollutionand become more aware through our online forum. Copyright
http://www.lightfromabove.org/

Extractions: Jennifer Barlow, a high school student in Midlothian, Virginia, began National Dark Sky Week (NDSW). NDSW for 2003 is set to occur from April 1st to April 8th, 10pm to 12 am (Eastern and Mountain Time Zones) and 9pm to 11pm (Central and Pacific Time Zones.) The purpose of the event is to reduce and raise awareness about light pollution. Visit the Official Web Site Read the Press Release
Light Pollution
Skyglow / light pollution. JPEG, GIF, TIFF. Experimental image modelinglight pollution in the continental United States. This
http://laps.fsl.noaa.gov/albers/slides/ast/places.html

Extractions: JPEG GIF TIFF Experimental image The image is a plot of expected sky glow at the zenith. Light pollution from a city is assumed to be related linearly to the population and the inverse 2.5 power of the distance (as in Walker's law). The relation used here is I = 11300000 x population x r^-2.5, where I is in nanoLamberts and r is in meters. This is corrected for earth's curvature at large distances (this necessity was pointed out by Roy Garstang). This is currently done by calculating what fraction of the air molecules and other scatterers over the observer lie within the earth's shadow as seen from the city. The overall scale height for these scatterers (defined as the incremental height required to see a drop off by a factor of 2.718) is currently set to 4000m. This is less than the "clear air" value of 8000m to account for a modest amount of aerosols. A number of ideas and equations used come from publications by Roy Garstang The assumed radius of each city is a function of city population, ranging from 2.5 km to 24 km. Walker's law applies if we are outside the city radius. Inside the city radius, the sky glow increases linearly toward the center by another factor of 2.5. A value for the natural sky glow is added onto the light pollution contribution. The natural sky glow is assumed to be equal to 60 nanoLamberts (V = 21.9 mag / sq sec) at solar minimum. The last step in arriving at a pixel value is scaling the brightness with respect to the logarithm of the sky glow. The brightest city has pixel values of (255,255,255), and the darkest country site has pixel values of (42,52,67). The calibration bar is intended to linearly represent the sky brightness in terms of magnitudes per square arcsec.
Redirecting
Extensive maps and data charting the extent of this form of pollution in Italy and the extent of its control using lighting codes.
http://debora.pd.astro.it/cinzano/defaulten.html
Light Pollution
light pollution Issues in New Jersey light pollution, what it is, and what youcan do about it. New Jersey light pollution Study Commission's Report.
http://www.erols.com/njastro/orgs/lightpol.htm

Extractions: Light Pollution, what it is, and what you can do about it. New Jersey Light Pollution Study Commission's Report Light Pollution: Everyone's Problem A UACNJ report by Gordon Bond. Example letters you can send to help fight the light pollution problem in New Jersey. Light Pollution: The Neglected Problem An article by John Batinsey, member of the Eatontown, New Jersey, Environmental Commission, summarizing the aspects of LP (A version of this article appeared with the same title in the Winter 1994 issue of ANJEC Report, the journal of the New Jersey Environmental Commissioners.) State Commission Reports on Light Pollution An update report by John Batinsey encouraging contacting the Governor's Office concerning the results of the commission, local and state action, as well as a few notes on the New Jersey Highway Authority installing cutoff lighting. Fred Schaaf's Light-Pollution Notes International DarkSky Association (IDA) Need further information on dealing with Light Pollution in your neighborhood? Check out the Information Sheets on IDS's Web-site.
IDA Utah
Lots of articles, images, starcharts information on light pollution and greatlinks too. Visit our light pollution Media Center. Here you'll find
http://www.utahskies.org/lightpollution/

Extractions: The Utah Section of The International Dark-Sky Association We are losing our heritage of starry nights. Artificial light in the night sky threatens to destroy the spectacular views the heavens offer. This "light pollution" wastes energy and provides no benefit to society. Light Pollution is misused or misdirected light:
Light Pollution And Boating Safety
Presentation explaining the problem that unshielded lighting presents to boat crews and how it can cause boating accidents. Requires Microsoft Powerpoint
http://members.aol.com/copernicanview/LP_Boating.ppt

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Light Pollution Or Not, That Is The Question
Amateur Astronomers and Wildlife Associations worldwide regard the increasing lightpollution with increasing concern. light pollution; a review of the law.
http://www.amtsgym-sdbg.dk/as/sky.htm

Extractions: Unfortunately, an undisturbed sky is no longer an experience possible for everybody. Amateur Astronomers and Wildlife Associations worldwide regard the increasing light pollution with increasing concern. Electric energy is wasted irrespective of world wide concern on CO2 pollution. Bad street illumination is clearly visible even from space satellites (click for a nightphoto of Europe) , and a new age of sky commercials has started. During the second world war, long range searchlights were applied to detect air-crafts attacking during night time. Today, modern versions of these searchlights are successfully applied by an increasing number of companies for advertising. Companies advertise with long range lasers, able to dominate the sky within a radius of 50 km. In the city of Sonderborg, Denmark, a local high tech company applied a computer controlled long range searchlight beam in short periods, without any public warning. As a result, the local newspaper gave strange eye witness reports: People claimed to have seen a real UFO!
Go Light On The Pollution - An Introduction To The Problem Of Light Pollution.
Simplywritten site where one can learn the cause of this threat to our environment, economy and society, and how to be part of the solution to the light pollution problem.
http://userpages.umbc.edu/~fmorga1/lp/en/index.html

Extractions: Light pollution is the emission of artificial light into areas where it is unneeded or unwanted. It is caused by obtrusive outdoor lighting (residential, commercial, or other) that wastefully casts light upward into the sky or into the horizontal plane. You will not be able to enjoy this page fully because your web browser does not support frames. Main Problems Solutions Glossary ... More Info
Canberra Astronomical Society - Light Pollution
Go to CAS Home Page, Canberra Astronomical Society. light pollution and Astronomy. Foramateur astronomers the problem of light pollution becomes a nightmare.
http://msowww.anu.edu.au/cas/light_pollution.html

Extractions: Astronomical Society Light Pollution and Astronomy By far the biggest problem facing amateur and professional astronomers is excess light. The reason observatories are built in remote areas is to get away from obtrusive lighting, smog and other bad "seeing" conditions, astronomers are not anti-social. A lot of planning must go into site selection to take advantage of the clear steady air in unpopulated areas. It is useless to build a facility that costs millions of dollars only to have its useful life cut short by the growth of a new city. For amateur astronomers the problem of light pollution becomes a nightmare. Light from shops, sports grounds and yard lighting limit, if not end totally, the usefulness of the "backyard observatory". Apart from the simple pleasure of looking at the night sky, the work of some amateurs supplements the work of professionals. These amateurs should be regarded as unpaid professional observers. The main function of a telescope is to amplify light from distant objects, as these objects are very faint. Stray light has the effect of washing out the contrast and reducing the image quality. If you turn up the brightness on your TV you can simulate the effect. The higher the brightness the more the image deteriorates. For an astronomer, that light YOU leave on in the back yard, or those flood lights in the driveway, can mean the end to any chance of using a telescope on all but the brightest of objects.
Light Pollution
light pollution. Here in Columbus, the level of light pollution is severe.Indeed, it is very difficult to see star below the 3rd magnitude.
http://www.coseti.org/pollutio.htm

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