YozoraAtlas

How dark is the sky in Upper Carniola?

Sky darkness for 5 towns and parks in Upper Carniola, worked out from NASA satellite images of light at night (2025). 2 of them have skies of Bortle 4 or darker, where the Milky Way shows overhead. The darkest is Triglav National Park (21.41, Bortle 4), the brightest Kranj (19.57, Bortle 5). Milky Way season in Upper Carniola runs April to July: on moonless nights the bright core stands clear of the horizon, climbing to about 15° 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

NASA satellite night-lights map of Upper Carniola with every place marked

Darkest skies in Upper Carniola

  1. Triglav National ParkBortle 421.41
  2. Udin Boršt Landscape ParkBortle 420.70

Among the places on this site. Plenty of land between them is just as dark, with no town or park to name it by.

Brightest city skies in Upper Carniola

  1. KranjBortle 519.57
  2. Škofja LokaBortle 520.37
  3. JeseniceBortle 520.39

All 5 places in Upper Carniola

Amber names are parks and certified dark-sky places. The figure is the Bortle class: 1 darkest, 9 city center.
Jesenice5Kranj5Triglav National Park4Udin Boršt Landscape Park4Škofja Loka5