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Panoramic View from Hornisgrinde

Black Forest, Southern Germany, 1164 m

Date:04.09.2022 Time:22:20 UT
Exposure:10 x 15 s and 11 x 30 s downward Field of view:360o x 180o
Camera:Canon EOS1D IV at ISO 3200 Optics:15 mm, f/2.8 and f/4.0 downward
Place:Hornisgrinde, Black Forest,
Southern Germany
Author:Till Credner

The brightness in the zenith was about 20.95 mag per arcsecond2 at 23:20 CET, 04.09.2022. This is 2.7 times more bright than the natural clear and moonless sky due to light pollution. Therefore the sky is brightened by 170 % by all the lights of the Rhine-valley, i.e. Strasbourg, Offenburg, Karlsruhe, ...in the directions west and north. In the eastern and southern direction lies the Black Forest with a much darker sky. Until 1:54 CET it darkened a bit to about 21.11 mag per arcsecond2. Measurements were obtained with SQM-LU-DL, serial number 2030.

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