Fig. 20: My stargazing equipment on the former Gurnigel tank shooting range for the upcoming Starparty. With the camera in the foreground, I took this time-lapse video. Contrary to expectations, the night became very clear and the air was absolutely calm. iPhone 8; Δt=1/202 s; f=3.99 mm; f/1.8; ISO 20; 3 September 2021 19:13:10