It is very important to preserve the night sky by limiting the amount of light we allow into our atmosphere.. For the week of the 13th, many organizations are promoting that we not use outdoor lighting, and refrain from using lights at night time. The Dark Sky Association started this event to inspire people to celebrate the beauty of the night sky, raise awareness about the negative affects of light pollution, and embolden folks to take action. For more information visit their website at http://www.darksky.org/int-l-dark-sky-week-main.