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Please note that the following street lights are not handled by The City. 2) When changing all light bulbs into LEDs, all LEDs start to flicker. Nevertheless they work fine when changing only 15 or less bulbs. Faulkner, D. R. 2013. Astronomical distance determination methods and the light travel time problem. Answers Research Journal 6:211–229. Retrieved from http://www.answersingenesis.org/articles/arj/v6/n1/astronomical-distance-light-travel-problem. Keywords: Light travel time problem, distant starlight But not all colors of light have the same effect. Blue wavelengths—which are beneficial during daylight hours because they boost attention, reaction times, and mood—seem to be the most disruptive at night. And the proliferation of electronics with screens, as well as energy-efficient lighting, is increasing our exposure to blue wavelengths, especially after sundown. Gaslight was followed by the invention of electric lighting in the latter half of the nineteenth century—the most profound technological development in lighting, and arguably one of the most important developments of modern infrastructure. Figuratively, electric lighting became synonymous with—and symbolic of—modern progress. For a Russian poet visiting New York City in the 1920s, the bright electric lights were perceived as modernity’s very medium (Isenstadt, 2014 Isenstadt, S. (2014). Good night. Places Journal. Retrieved 22 October, 2014, from https://placesjournal.org/article/good-night/[Crossref] [Google Scholar]). Aided by various technical advances, for example, floodlights, electric lighting quickly became a ‘sophisticated cultural apparatus’ that could be used for advertising, commemorating history, expressing civic pride, highlighting monuments, etc. (Nye, 1990 Nye, D. E. (1990). Electrifying America: Social meanings of a new technology, 1880–1940. Cambridge: MIT Press. [Google Scholar], p. 73). Via electrification, artificial nighttime lighting became, and remains, a prolific technological artifact capable of esthetic and ideological expression well beyond functional requirements.44. Neumann’s’ Architecture of the Night (2002a Neumann, D. (Ed.). (2002a). Architecture of the night: The illuminated building. New York, NY: Prestel. [Google Scholar]) is arguably the most important recent study of nighttime illumination in architectural history and theory, linking the history of nighttime lighting with the history of modern architecture. Neumann mainly focuses on the esthetic and expressive qualities of ‘illuminated buildings’ throughout the nineteenth and twentieth centuries, providing the first comprehensive catalogue of relevant architectural projects.View all notes About 1.7 billion people or more than a fifth of the world’s population are without access to electricity and modern lighting. The problem is most severe in rural areas or on the fringes of cities. , however the extent to rural electrification varies widely from country to country.  For example, 90% of Africa is not served by grid electricity versus 20% of Mexico. In fact, some African countries, for example, Rwanda and Burundi have barely passed the 1% electrification threshold! Concerns have also remained regarding the inverse of proliferating nighttime lighting, namely the rapidly declining access to a natural night sky in the developed world. In recent decades attempts to quantify skyglow and its global presence have emerged, however, data is still somewhat sparse. The first attempt to map this phenomenon on a global scale was published by Cinzano et al. (2001 Cinzano, P., Falchi, F., & Elvidge, C. D. (2001). The first world Atlas of the artificial night sky brightness. Monthly Notices of the Royal Astronomical Society, 328, 689–707.10.1046/j.1365-8711.2001.04882.x[Crossref], [Web of Science ®] [Google Scholar]). A more recent study by Gallaway et al. (2010 Gallaway, T., Olsen, R., & Mitchell, D. (2010). The economics of global light pollution. Ecological Economics, 69, 658–665.10.1016/j.ecolecon.2009.10.003[Crossref], [Web of Science ®] [Google Scholar]) built on their findings and concluded that the amount of people living in areas with a ‘polluted night sky’ is extremely high: around 99% in both North America and the European Union.88. Gallaway et al. (2010 Gallaway, T., Olsen, R., & Mitchell, D. (2010). The economics of global light pollution. Ecological Economics, 69, 658–665.10.1016/j.ecolecon.2009.10.003[Crossref], [Web of Science ®] [Google Scholar]) utilize the threshold criteria established by Cinzano et al. (2001 Cinzano, P., Falchi, F., & Elvidge, C. D. (2001). The first world Atlas of the artificial night sky brightness. Monthly Notices of the Royal Astronomical Society, 328, 689–707.10.1046/j.1365-8711.2001.04882.x[Crossref], [Web of Science ®] [Google Scholar]) for considering an area ‘polluted’ by light. These criteria ‘consider the night sky polluted when the artificial brightness of the sky is greater than 10% of the natural sky brightness above 45° of elevation’ (Gallaway et al., 2010 Gallaway, T., Olsen, R., & Mitchell, D. (2010). The economics of global light pollution. Ecological Economics, 69, 658–665.10.1016/j.ecolecon.2009.10.003[Crossref], [Web of Science ®] [Google Scholar], p. 660).View all notes Furthermore, on both continents approximately 70% of the population lives in areas where brightness at night is at least three times natural levels. From a dark rural area, our unaided eyes can normally see up to 3,000 stars; people with strong eyesight can even see close to 7,000 stars. However, in many urban areas today this number is reduced to around 50, or perhaps even less (Mizon, 2012 Mizon, B. (2012). Light pollution: Responses and remedies (2nd ed.). New York, NY: Springer.10.1007/978-1-4614-3822-9[Crossref] [Google Scholar]). Researchers caution that if the current pace of increasing brightness continues, the ‘pristine night sky’ could become ‘extinct’ in the continental United States by 2025 (Fischer, 2011 Fischer, A. (2011). Starry night. Places Journal. Retrieved 22 October, 2014,. from https://placesjournal.org/article/starry-night/[Crossref] [Google Scholar]). In 2007, “shift work that involves circadian disruption” was listed as a probable carcinogen by the World Health Organization’s International Agency for Research on Cancer. (IARC Press release No. 180).[41][42] Multiple studies have documented a correlation between night shift work and the increased incidence of breast and prostate cancer.[43][44][45][46][47][48] One study which examined the link between exposure to artificial light at night (ALAN) and levels of breast cancer in South Korea found that regions which had the highest levels of ALAN reported the highest number of cases of breast cancer.  Seoul, which had the highest levels of light pollution, had 34.4% more cases of breast cancer than Ganwon-do, which had the lowest levels of light pollution. This suggested a high correlation between ALAN and the prevalence of breast cancer.It was also found that there was no correlation between other types of cancer such as cervical or lung cancer and ALAN levels.[49] Section 2 discusses the moral and political significance of framing problems, in relation to the novel environmental problem of excess artificial nighttime lighting in cities. Section 3 then analyzes the concept of light pollution in detail. Here, both the origins of the concept and its current manifestations are presented, in order to provide a more comprehensive understanding of light pollution. Section 4 returns to the question of how light pollution frames concerns and possible responses, and discusses two interrelated questions: the potential limitations of the concept as a normative or prescriptive tool, and the ambiguities and inconsistencies in its practical application that require clarification. Thus, first steps are taken in dissecting the ethical significance of the concept of light pollution and the role it can play in addressing the adverse effects of artificial nighttime lighting. When reporting a lighting fault to us it would be helpful if you could supply: Your Check Engine Light may be indicating a simple problem that’s easy to fix – such as a loose gas cap. Or, it could be a warning of a more serious problem that could damage your engine components. Finding out why your light is on now can save you money and trouble down the road. If the lightbulb flickers, follow this troubleshooting procedure: Use the form below to let us know where the problem is.  Our field personnel typically address light issues within 72 hours of a reported issue. A change in the speed of light would quite literally end the world as we know it. The speed of light is not an arbitrary speed with no effect on outside systems, but is in fact a component in one of the most fundamental equations in the universe[6], the equation for matter: E = mc2 where E is energy, m is mass, and c is the speed of light in a vacuum.[7] This means that any increase of the speed of light would in turn increase the amount of energy released by the reactions of matter. Because the Sun, or indeed any star, relies on the reactions of matter, most notably nuclear fusion, a change in the speed of light would alter its energy output; if light were traveling as fast as some creationists demand, then the energy output of the Sun could be expected to increase over 800,000,000 times.[8][9] Maca peruana Tonus Fortis el macho erogan Testogen BeMass BeMass BioBelt Masculin Active BioBelt

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