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:	360^o x 180^o
Camera:	Canon EOS1D IV at ISO 2000	Optics:	15 mm, f/2.8
Place:	Onstmettingen, 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.

More images from Zeller Horn