How dark is the sky in Basel-City?
Sky darkness for Basel (19.15, Bortle 6), so far the only place in Basel-City on Yozora Atlas, worked out from NASA satellite images of light at night (2025). Milky Way season in Basel-City runs May to July: on moonless nights the bright core stands clear of the horizon, climbing to about 13° at its highest.
19
Bortle class, 1 pristine to 9 city center
park or dark-sky place
city
Numbers like 21.95 or 16.97 are the brightness of the sky overhead on a clear, moonless night, in mag/arcsec². The scale runs backwards: a lower number means a brighter sky, from about 22 for a natural sky to about 17 in a city center.
How the readings are made
Darkest skies in Basel-City
Among the places on this site. Plenty of land between them is just as dark, with no town or park to name it by.
All 1 place in Basel-City
Amber names are parks and certified dark-sky places. The figure is the Bortle class: 1 darkest, 9 city center.