How dark is the sky in Denmark?
Sky darkness for 41 towns and parks in Denmark, worked out from NASA satellite images of light at night (2025). 12 of them have skies of Bortle 4 or darker, where the Milky Way shows overhead. The darkest is Bulbjerg (21.79, Bortle 3), the brightest Copenhagen (18.53, Bortle 7).
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
Darkest skies in Denmark
- BulbjergNorth Denmark · Bortle 321.79
- Thy National ParkNorth Denmark · Bortle 321.78
- AnholtCentral Jutland · Bortle 321.77
- MandøSouth Denmark · Bortle 421.69
- NyordZealand · Bortle 421.62
Among the places on this site. Plenty of land between them is just as dark, with no town or park to name it by.
Darkest place in each region of Denmark
| Region | Places | Dark places Bortle 1 to 4 | Darkest place |
|---|---|---|---|
| Capital Region | 5 places | 1 dark | Kongernes Nordsjælland National Park20.84 · Bortle 4 |
| Central Jutland | 12 places | 3 dark | Anholt21.77 · Bortle 3 |
| North Denmark | 6 places | 3 dark | Bulbjerg21.79 · Bortle 3 |
| South Denmark | 9 places | 1 dark | Mandø21.69 · Bortle 4 |
| Zealand | 9 places | 4 dark | Nyord21.62 · Bortle 4 |