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Panoramic View from Zeller Horn

with Hohenzollern Castle, Swabian Jura, Southern Germany, 890 m

Date:09.10.2021 Time:22:40 UT (CET-1h)
Exposure:21 x 20 s Field of view:360o x 180o
Camera:Canon EOS1D IV at ISO 2000 Optics:15 mm, f/2.8
Southern Germany
Author:Till Credner

The brightness in the zenith was down to 21.07 mag per arcsecond2 at about 00:17 CET, 10.10.2021. 21.07 mag per arcsecond2 is 2.4 times more bright than the natural clear and moonless sky. This is mainly due to light pollution Therefore the sky is brightened by 140 %. Measurements were obtained with SQM-LU-DL, serial number 2030. Strongest sources of light pollution are the cities of Bisingen, Hechingen and Stetten, all about 4 km distant. Many lights are cold white and not completely shielded, therefore increasing the amount of light pollution significantly.

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