YozoraAtlas

How dark is the sky in South Moravian Region?

Sky darkness for 8 towns and parks in South Moravian Region, worked out from NASA satellite images of light at night (2025). 3 of them have skies of Bortle 4 or darker, where the Milky Way shows overhead. The darkest is Podyjí National Park (21.30, Bortle 4), the brightest Brno (18.65, Bortle 7). Milky Way season in South Moravian Region runs June: on moonless nights the bright core stands clear of the horizon, climbing to about 12° 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 South Moravian Region with every place marked

Darkest skies in South Moravian Region

  1. Podyjí National ParkBortle 421.30
  2. Soutok Protected Landscape AreaBortle 421.00
  3. Pálava Protected Landscape AreaBortle 420.93

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 South Moravian Region

  1. BrnoBortle 718.65
  2. ZnojmoBortle 519.78
  3. BřeclavBortle 519.95
  4. VyškovBortle 519.97
  5. HodonínBortle 520.07

All 8 places in South Moravian Region

Amber names are parks and certified dark-sky places. The figure is the Bortle class: 1 darkest, 9 city center.
Brno7Břeclav5Hodonín5Podyjí National Park4Pálava Protected Landscape Area4Soutok Protected Landscape Area4Vyškov5Znojmo5