Exploring the Universe from Southwest Virginia.  established 1996
© ERAS 2013
              ECHO RIDGE ASTRONOMICAL SOCIETY
DARK
SKY
METER
Sky Quality Meter located on Gem Stream Road, Elk Creek, Va.
NELM Readings
Mag/Sq Arcsec
NELM = Naked Eye Limiting Magnitude
Most recent reading
Model : Unihedron SQM-LE/LU with Uniherdron weatherproof housing. Software: Knightware SQM Reader Pro 2. The SQM meter is currently set to run only at night and is pointed towards the zenith. It takes a reading every 5 minutes and after the third reading it averages the 3 and records it.  It is used  for astronomical purposes and will be used to quantify the ever growing problem of light  pollution on Grayson County.
REFRESH YOUR SCREEN FOR THE LATEST READING.
NELM or naked eye limiting magnitude reading is the theoretical lowest magnitude star visible to the naked eye at the zenith with clear skies and that amount of darkness.