YozoraAtlas

How dark is the sky in West Greece?

Sky darkness for 7 towns and parks in West Greece, 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 Chelmos-Vouraikos National Park (21.46, Bortle 4), the brightest Patras (18.91, Bortle 7). Milky Way season in West Greece runs March to September: on moonless nights the bright core stands clear of the horizon, climbing to about 23° 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 West Greece with every place marked

Darkest skies in West Greece

  1. Chelmos-Vouraikos National ParkBortle 421.46
  2. Kotychi and Strofylia Wetlands National ParkBortle 421.09
  3. Messolonghi Lagoons National ParkBortle 420.59

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 West Greece

  1. PatrasBortle 718.91
  2. AgrinioBortle 619.04
  3. PyrgosBortle 519.82
  4. AigioBortle 520.21

All 7 places in West Greece

Amber names are parks and certified dark-sky places. The figure is the Bortle class: 1 darkest, 9 city center.
Agrinio6Aigio5Chelmos-Vouraikos National Park4Kotychi and Strofylia Wetlands National Park4Messolonghi Lagoons National Park4Patras7Pyrgos5