YozoraAtlas

How dark is the sky in Central Jutland?

Sky darkness for 12 towns and parks in Central Jutland, 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 Anholt (21.77, Bortle 3), the brightest Aarhus (19.18, Bortle 6). The bright core of the Milky Way never climbs clear of the horizon haze anywhere in Central Jutland while the sky is fully dark; the rest of the band passes overhead, with the longest moonless nights from September to March.

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 Central Jutland with every place marked

Darkest skies in Central Jutland

  1. AnholtBortle 321.77
  2. Fussingø National Nature ParkBortle 421.44
  3. Mols Bjerge National ParkBortle 421.44

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 Central Jutland

  1. AarhusBortle 619.18
  2. HorsensBortle 519.78
  3. RandersBortle 519.83
  4. HerningBortle 519.92
  5. ViborgBortle 520.04

All 12 places in Central Jutland

Amber names are parks and certified dark-sky places. The figure is the Bortle class: 1 darkest, 9 city center.
Aarhus6Anholt3Fussingø National Nature Park4Hedensted5Herning5Holstebro5Horsens5Mols Bjerge National Park4Randers5Silkeborg5Skive5Viborg5