Panoramic View from Achalm

Reutlingen, Swabian Jura, Southern Germany, 707 m + 9 m

Date:	09.04.2023	Time:	20:11 - 20:33 UT
Exposure:	10 x 15 s and 11 x 30 s downward	Field of view:	360^o x 180^o
Camera:	Canon EOS1D IV at ISO 1250	Optics:	15 mm, f/3.2 and f/4.5 downward
Place:	Achalm, Reutlingen, Southern Germany	Author:	Till Credner

The full panorama was taken from the Achalm-Tower about 330 m above the city of Reutlingen. The brightness in the zenith was 20.26 mag/arcsecond² at 22:11 CEST, 09.04.2023, when the zenith image was taken. This is 5 times more bright than the natural clear and moonless sky due to light pollution. Therefore the sky is brightened by 400 % by all the unsufficient shielded city lights of Reutlingen, Pfullingen, Metzingen, Stuttgart and around. The brightness went down to 20.44 mag/arcsecond² until 23:40 CEST, when measurements were stopped. Brightness values were obtained with SQM-LU-DL, serial number 2030.