YozoraAtlas

How dark is the sky in Epirus?

Sky darkness for 6 towns and parks in Epirus, worked out from NASA satellite images of light at night (2025). 4 of them have skies of Bortle 4 or darker, where the Milky Way shows overhead. The darkest is North Pindos National Park (21.60, Bortle 4), the brightest Ioannina (19.28, Bortle 6). Milky Way season in Epirus runs March to September: on moonless nights the bright core stands clear of the horizon, climbing to about 22° 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 Epirus with every place marked

Darkest skies in Epirus

  1. North Pindos National ParkBortle 421.60
  2. Vikos-Aoös National ParkBortle 421.59
  3. Amvrakikos Wetlands National ParkBortle 421.19
  4. Tzoumerka National ParkBortle 421.15

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 Epirus

  1. IoanninaBortle 619.28
  2. ArtaBortle 519.85

All 6 places in Epirus

Amber names are parks and certified dark-sky places. The figure is the Bortle class: 1 darkest, 9 city center.
Amvrakikos Wetlands National Park4Arta5Ioannina6North Pindos National Park4Tzoumerka National Park4Vikos-Aoös National Park4