YozoraAtlas

How dark is the sky in Trentino-Alto Adige?

Sky darkness for 11 towns and parks in Trentino-Alto Adige, worked out from NASA satellite images of light at night (2025). 9 of them have skies of Bortle 4 or darker, where the Milky Way shows overhead. The darkest is Rieserferner-Ahrn Nature Park (21.61, Bortle 4), the brightest Trento (19.23, Bortle 6). Milky Way season in Trentino-Alto Adige runs May to July: on moonless nights the bright core stands clear of the horizon, climbing to about 15° 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 Trentino-Alto Adige with every place marked

Darkest skies in Trentino-Alto Adige

  1. Rieserferner-Ahrn Nature ParkBortle 421.61
  2. Sexten Dolomites Nature ParkBortle 421.53
  3. Fanes-Sennes-Prags Nature ParkBortle 421.52
  4. Texelgruppe Nature ParkBortle 421.45
  5. Puez-Geisler Nature ParkBortle 421.40

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 Trentino-Alto Adige

  1. TrentoBortle 619.23
  2. BolzanoBortle 619.25

All 11 places in Trentino-Alto Adige

Amber names are parks and certified dark-sky places. The figure is the Bortle class: 1 darkest, 9 city center.
Adamello Brenta Nature Park4Bolzano6Fanes-Sennes-Prags Nature Park4Paneveggio-Pale di San Martino Nature Park4Puez-Geisler Nature Park4Rieserferner-Ahrn Nature Park4Schlern-Rosengarten Nature Park4Sexten Dolomites Nature Park4Texelgruppe Nature Park4Trento6Trudner Horn Nature Park4