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Everyone has slightly different circadian rhythms, but the average length is 24 and one-quarter hours. The circadian rhythm of people who stay up late is slightly longer, while the rhythms of earlier birds fall short of 24 hours. Dr. Charles Czeisler of Harvard Medical School showed, in 1981, that daylight keeps a person’s internal clock aligned with the environment. Attaching the language and connotations of pollution to nighttime lighting is effective, but may also set boundaries on possible solutions. This is a very specific answer to the question of how much light is appropriate, which comes with limitations. As a moral concept, light pollution can tell us what bad lighting is, but says relatively little about what good lighting is. Because of the focus on the (adverse) causes and effects of artificial nighttime lighting, the concept is limited in its capacity to inform choices within the realm good lighting, especially in cities where there are other values at play. Light pollution says very little about artificial nighttime illumination deemed to be within the acceptable limits of polluting, or the many values and needs strived for therein (for example, esthetics and nightlife). Thus, there are limits to the capacity of light pollution to inform moral evaluations, as it frames decisions as questions about acceptable levels of polluting. The big bang requires that opposite regions of the visible universe must have exchanged energy by radiation, since these regions of space look the same in CMB maps. But there has not been enough time for light to travel this distance. Both biblical creationists and big bang supporters have proposed a variety of possible solutions to light-travel–time difficulties in their respective models. So big-bangers should not criticize creationists for hypothesizing potential solutions, since they do the same thing with their own model. The horizon problem remains a serious difficulty for big bang supporters, as evidenced by their many competing conjectures that attempt to solve it. Therefore, it is inconsistent for supporters of the big bang model to use light-travel time as an argument against biblical creation, since their own notion has an equivalent problem. Light pollution has emerged as the widely accepted term for the negative or adverse effects of artificial nighttime illumination (Hölker et al., 2010 Hölker, F., Moss, T., Griefahn, B., Kloas, W., Voigt, C., Henckel, D., … Tockner, K. (2010). The dark side of light: A transdisciplinary research agenda for light pollution policy. Ecology and Society, 15(4), 13.10.5751/ES-03685-150413[Crossref], [Web of Science ®] [Google Scholar]). A central assumption of this paper is that the concept of light pollution—due to its increasing usage within professional, academic, and popular discourse—will substantially shape decisions about how to illuminate cities in the twenty-first century. In this role, it will actively inform the conditions for morally acceptable and desirable artificial nighttime illumination. Thus, to a large extent the concept of light pollution helps to provide a framing that addresses our new problem. This, however, necessitates an evaluation of the concept’s usefulness—its strengths and limitations. Its increasing usage must be coupled with critical reflection, if it is to offer an effective framing for ongoing policy efforts. In Policy Paradox, Stone (2002 Stone, D. (2002). Policy paradox: The art of political decision making. New York, NY: W. W. Norton & Company Inc. [Google Scholar]) discusses the complex issue of defining problems within political discourse. It is never an objective statement, but rather a strategic representation from one point of view that will promote a certain course of action. While problem definitions can act as a ‘… vehicle for expressing moral values … there is no universal technical language of problem definition that yields morally correct answers’ (p. 134). Nonetheless, focusing on how a problem is defined can help us see the situation from multiple perspectives and identify assumptions about facts and values embedded therein (Stone, 2002 Stone, D. (2002). Policy paradox: The art of political decision making. New York, NY: W. W. Norton & Company Inc. [Google Scholar]). This can, in turn, help to strengthen the problem definition. Please use this form to report a lighting issue. Column Number: Asset Id: Street: Included in part-time night lighting scheme: Known fault: Apart from emitting light, the sky also scatters incoming light, primarily from distant stars and the Milky Way, but also the zodiacal light, sunlight that is reflected and backscattered from interplanetary dust particles. This paper has critically engaged with the concept of light pollution and identified areas that require further clarification. The limitation of light pollution as a criterion for the moral evaluation of artificial nighttime lighting was discussed, concluding that it can best function in the limited capacity of mitigation or preservation efforts. This led to practical concerns, specifically the ambiguity of thresholds for acceptable levels of light pollution, and the mechanisms that could be used to establish said thresholds. The intention was to highlight conceptual and practical issues that, if addressed, can help to strengthen future regulatory efforts in urban nighttime lighting. Currently, the most popular idea is called ‘inflation’—a conjecture invented by Alan Guth in 1981. In this scenario, the expansion rate of the universe (i.e. space itself) was vastly accelerated in an ‘inflation phase’ early in the big bang. The different regions of the universe were in very close contact before this inflation took place. Thus, they were able to come to the same temperature by exchanging radiation before they were rapidly (faster than the speed of light1) pushed apart. According to inflation, even though distant regions of the universe are not in contact today, they were in contact before the inflation phase when the universe was small. Of course, it must be remembered that the aforementioned biblical references to the stretching of the heavens appear in poetic passages that are unlike the record of Day Four in Genesis 1:14–19, which bears all the markings of prose (Boyd 2005). Consequently, “stretching” in these instances may be a metaphorical device that refers to nothing more than the creation of the heavens in their expanse. In other words, the language employed is likely not specific enough to enlist as certain evidence for the defense of my view. Nevertheless, the language surely does not preclude the position I have advanced; indeed, if the text does intend to convey the idea of light travelling at an abnormally accelerated rate in order to reach the earth on Day Four (or, at the very latest, Day Six), then reference to God stretching out the heavens is quite appropriate. Several different types of light sources exist, each having different properties that affect their appropriateness for certain tasks, particularly efficiency and spectral power distribution. It is often the case that inappropriate light sources have been selected for a task, either due to ignorance or because more sophisticated light sources were unavailable at the time of installation. Therefore, badly chosen light sources often contribute unnecessarily to light pollution and energy waste. By re-assessing and changing the light sources used, it is often possible to reduce energy use and pollutive effects while simultaneously greatly improving efficiency and visibility. The Swiss Agency for Energy Efficiency (SAFE) uses a concept that promises to be of great use in the diagnosis and design of road lighting, “consommation électrique spécifique (CES)”, which can be translated into English as “specific electric power consumption (SEC)”.[99] Thus, based on observed lighting levels in a wide range of Swiss towns, SAFE has defined target values for electric power consumption per metre for roads of various categories. Thus, SAFE currently recommends an SEC of 2 to 3 watts per meter for roads of less than 10 metre width (4 to 6 watts per metre for wider roads). Such a measure provides an easily applicable environmental protection constraint on conventional “norms”, which usually are based on the recommendations of lighting manufacturing interests, who may not take into account environmental criteria. In view of ongoing progress in lighting technology, target SEC values will need to be periodically revised downwards. erogan Celuraid Muscle Penigen 500 Testogen el macho Atlant Gel erogan Atlant Gel Tonus Fortis Maca peruana