Evening 16 July - SQM readings
No observing tonight, but I had the SQM from the library. I haven't done any measurements in quite a while. 23:52 MDT , I took some measurements from my unfinished observatory. The walls are up (5' tall) so I held it below the top to shield it from outside light. Measurements were 21.36, 21.37, and 21.35 mpas at zenith. Average 21.36. Holding on top of the telescope on pier puts it about 6" above the wall and I got 21.33, 21.27, and 21.28 at zenith. Average 21.29 mpas. I aimed it about 20 degrees above the horizon to the north and got 21.14mpas. There is skyglow from a town about 18 miles due north of us. Aimed south about the same distance above the horizon, I got 20.26 mpas. The truss company with its exterior lights is just under half a mile due south, and our small town is right at 1 mile. Moving into the backyard but screened by trees from other lights I got 21.33, 21.29, and 21.35 mpas. Average 21.32. According to the pamphlet in the Starry Sky kit with th...