![]() "The daily rise and set times of the celestial bodies" shows the times of rise and set of the celestial bodies on the current day. Detailed information can be found at and The night sky brightness (NSB) is measured by the SQM-LE Night Sky Brightness monitors at the monitoring stations on the Hong Kong Night Sky Brightness Monitoring Network (NSN) and the Globe at Night - Sky Brightness Monitoring Network (GaN-MN) smaller value represents brighter sky while larger value represents darker sky. For every two hours gone, the star map for the following month can be used. "Monthly Star Map" shows the night sky at around eight o'clock of that particular month. For details, please refer to "Contact and Support".Īll astronomical information is calculated for mean sea level at latitude 22☁8'7.3", longitude 114☁0'27.6", which is the location of the Hong Kong Observatory, based on astronomical data provided by the HM Nautical Almanac Office, United Kingdom and the United States Naval Observatory. Presentation of the webpage may vary according to different browsers, computers and operating systems. Here, you will find a variety of sample letters, and please see How to Help for the most powerful things you can do to help reduce light pollution.If your browser is not supported, you may not be able to use some special features and the response could be relatively slow. Please take 2 minutes to watch the beautiful trailer of " Saving the Dark " by Sriram Murali, below, which perfectly states what I wish all people knew-that we *can* reclaim our night sky! It will take all of us speaking up to our cities, asking for amber dark-sky lighting, and we must act fast, as new, even worse lighting, white LEDs, are currently being chosen. We just need to stand together as a society (as we did with limiting cigarette smoking in public areas of the U.S.) and let our towns know we want it! We don't have to settle for white LED streetlights and commercial lighting when there are amber LEDs that are affordable, efficient, and practical. Thank you for reading! I appreciate you! As you can see, with amber dark-sky lighting, we all win! It's widely available and affordable. They use mostly * amber * dark-sky lighting, and it's now widely available -people just need to know about it. This solution to light pollution began with Flagstaff Dark Skies Coalition , when in the 1950s, they realized the necessity of protecting their dark skies, and they now have the darkest skies of probably any illuminated city you will find. It is dimmed and no brighter than necessary, is only used where or when needed, and often uses timers or motion detectors.For further understanding, please see Dark-Sky Resources. However, choose warm white or low CCT (2700 kelvin or less) over a higher kelvin white LED. Amber LEDs are a better choice than warm white or low CCT white LEDS. It is amber in color instead of blue, green or white. ![]() (Skip to 4:50 of "Losing the Dark," below, to see this demonstrated). It's simply a way of lighting that helps keep the sky dark by fully shielding the light bulb on the top and sides so the light is directed down rather than to the sides and up to the sky, which creates glare, excess light and hides our stars.
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