Tag Archives: oldest observatories

Sky Quality Monitoring

I regularly use a “Sky Quality Meter” made by Unihedron.  This nifty little handheld device measures the sky brightness in visual magnitudes per square arcsecond. Here is a plot of data taken from Xanadu Observatory.  The measurements were taken at approximately 9:00 – 10:00 p.m. local time (0400 – 0500 UTC) when possible.  I typically… Continue reading »