YozoraAtlas

How dark is the sky in Bratislava Region?

Sky darkness for 4 towns and parks in Bratislava Region, worked out from NASA satellite images of light at night (2025). 1 of them has skies of Bortle 4 or darker, where the Milky Way shows overhead. The darkest is Záhorie Protected Landscape Area (20.74, Bortle 4), the brightest Bratislava (18.33, Bortle 8). Milky Way season in Bratislava Region 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

NASA satellite night-lights map of Bratislava Region with every place marked

Darkest skies in Bratislava Region

  1. Záhorie Protected Landscape AreaBortle 420.74

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 Bratislava Region

  1. BratislavaBortle 818.33
  2. PezinokBortle 519.64
  3. SenecBortle 519.64

All 4 places in Bratislava Region

Amber names are parks and certified dark-sky places. The figure is the Bortle class: 1 darkest, 9 city center.
Bratislava8Pezinok5Senec5Záhorie Protected Landscape Area4