Light pollution is excessive, misdirected, or obtrusive artificial (usually outdoor) light. Too much light pollution has consequences: it washes out starlight in the night sky, interferes with astronomical research, disrupts ecosystems, has adverse health effects and wastes energy.
A little more than 100 years ago, you could walk outside at night even in a city and see the Milky Way galaxy arch across the night sky. Being able to see thousands of stars was part of everyday life, inspiring artists like Van Gogh, musical composers like Holst and writers like Shakespeare. By allowing artificial lights to wash out our starry night skies, we are losing touch with our cultural heritage (e.g., what has made us who we are). We are also losing touch with what could inspire future generations.
With more than half of the world’s population now living in cities, most people have never experienced the wonderment of pristinely dark skies. How do you explain the importance of what they’ve lost to light pollution? How can you make them aware that light pollution is a concern on many fronts: safety, energy conservation, cost, health and effects on wildlife, as well as our ability to view the stars? Finally, how do you convince them that it’s worthwhile to take even small steps, to help fix this problem?
(Image credit: NASA)

Effects of Light Pollution
In disrupting ecosystems, light pollution poses a serious threat in particular to nocturnal wildlife, having negative impacts on plant and animal physiology. It can confuse the migratory patterns of animals, alter competitive interactions of animals, change predator-prey relations, and cause physiological harm. The rhythm of life is orchestrated by the natural diurnal patterns of light and dark; so disruption to these patterns impacts the ecological dynamics.
With respect to adverse health effects, many species, especially humans, are dependent on natural body cycles called circadian rhythms and the production of melatonin, which are regulated by light and dark (e.g., day and night). If humans are exposed to light while sleeping, melatonin production can be suppressed. This can lead to sleep disorders and other health problems such as increased headaches, worker fatigue, medically defined stress, some forms of obesity due to lack of sleep and increased anxiety. Ties are being found to a couple of types of cancer and there are also effects of glare on aging eyes. (See text below.) Health effects are not only due to over-illumination or excessive exposure of light over time, but also improper spectral composition of light (i.e. certain colours of light).
With respect to energy wastage, lighting is responsible for at least a quarter of all electricity consumption worldwide. Over illumination can constitute energy wastage, especially upward directed lighting at night. Energy wastage is also a waste in cost and increases our carbon footprint.
The good news is that light pollution can be reduced fairly easily by shielding lights properly, by only using light when and where it is needed, by only using the amount that is needed, by using energy efficient bulbs, and by using bulbs with appropriate spectral power distributions for the task at hand.
Going further… Three Main Types of Light Pollution
Clinically speaking, the three main types of light pollution include glare, light trespass and skyglow (in addition to over-illumination and clutter). Glare from unshielded lighting is a public-health hazard—especially the older you become. Glare light scattering in the eye causes loss of contrast, sometimes blinds you temporarily and leads to unsafe driving conditions, for instance. Light trespass occurs when unwanted light enters one’s property, for example, by shining unwanted light into a bedroom window of a person trying to sleep. Skyglow refers to the glow effect that can be seen over populated areas. Skyglow is the combination of all the reflected light and upward-directed (unshielded) light escaping up into the sky (and for the most part, unused). Shielding lights significantly reduces all three of these types of light pollution. This exercise means to raise awareness of the impact on light pollution within students.
Preparation
The Stellarium software should be downloaded and be available to the students. It will also need to be projected. http://www.stellarium.org/en_GB/ The Stellarium FAQ contains a user-guide: http://www.stellarium.org/wiki/index.php/FAQ
As the teacher you will also require Excel to collate and plot the data.
Tip: You can obtain your geographic coordinates from google maps and enter them into Stellarium. This will give you a view of the local night sky.
To inspire the students, the teacher is encouraged to give an introduction to the concept of light pollution. The background information section contains pertinent information. It is recommended to show images of Earth viewed from the ISS provided and the time-lapse videos as well.
- Image: Iberian Peninsula at Night http://www.nasa.gov/content/iberian-peninsula-at-night/#.VPciDfmsX-U
- Time-lapse video: https://vimeo.com/78978601