 Tim: Using The Sky v 0 level II, and inputing today's date, noon, 00.0 N, I get an altitude of 00 deg 00minutes looking due South. Inputting 00 N, same date & time, looking due South, I get 00 deg 00 minutes altitude. I'm hazarding a guess that the light shadow from top of pole to ground is from that altitude relevant to the Sun. 00 N fits the bill. No way to tell if it's another copter shining a light down or not. 