Hi, thought this is a good exercise we can do. IDA is do a worldwide survey of the night sky light pollution from 8-21 of Mar. What you need to do is to go into IDA link http://www.globe.gov/globeatnight/ and take 5 short actions :
1) Find your latitude and longitude.
2) Find Orion by going outside an hour after sunset
(about 7-10pm local time)
3) Match your nighttime sky to one of our magnitude charts.
4) Report your observation.
5) Compare your observation to thousands around the world
This will all be in the IDA site. I just did the survey today and I report the SIngapore sky limited magnitude as 3-4.
More information below:
The National Optical Astronomy Observatory (NOAO), along with the International Dark-Sky Association (IDA), Global Learning and Observations to Benefit the Environment (GLOBE) and others, invite you to join thousands of other students, families and citizen-scientists hunting for stars during March 8–21, 2007. Take part in this international event called GLOBE at Night to observe the nighttime sky and learn more about light pollution around the world.
GLOBE at Night is an easy observation and reporting activity that takes approximately 15–30 minutes to complete. Citizen-scientists record the brightness of the night sky by matching its appearance toward the constellation Orion with one of seven stellar maps of different limiting magnitude. They then submit measurements online. Resulting maps of all observations are created and placed back online by the GLOBE at Night staff within the weeks that follow.
During the 2006 event over 18,000 people from 96 countries submitted observations, including data from every U.S. state. Help us exceed these numbers in 2007!