How dark is the sky in Prešov Region?
Sky darkness for 10 towns and parks in Prešov Region, worked out from NASA satellite images of light at night (2025). 5 of them have skies of Bortle 4 or darker, where the Milky Way shows overhead. The darkest is the Poloniny Dark Sky Park (21.70, Bortle 3), the brightest Prešov (19.25, Bortle 6). Milky Way season in Prešov Region runs May to June: on moonless nights the bright core stands clear of the horizon, climbing to about 12° at its highest.
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 Prešov Region
- the Poloniny Dark Sky ParkBortle 321.70
- East Carpathians Protected Landscape AreaBortle 421.61
- Slovak Paradise National ParkBortle 421.42
- Pieniny National Park (Slovakia)Bortle 421.02
- SninaBortle 420.72
Among the places on this site. Plenty of land between them is just as dark, with no town or park to name it by.