YozoraAtlasyo·zo·ra (夜空) n. [Jap.] night sky

How dark is the sky in Latgale?

Sky darkness for 4 towns and parks in Latgale, worked out from NASA satellite images of light at night (2025). 2 of them have skies of Bortle 4 or darker, where the Milky Way shows overhead. The darkest is Rāzna National Park (21.80, Bortle 3), the brightest Daugavpils (18.80, Bortle 7). The bright core of the Milky Way never climbs clear of the horizon haze anywhere in Latgale 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 Latgale with every place marked

Darkest skies in Latgale

  1. Rāzna National ParkBortle 321.80
  2. Istra Hills Nature ParkBortle 321.78

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 Latgale

  1. DaugavpilsBortle 718.80
  2. RēzekneBortle 619.48

All 4 places in Latgale

Amber names are parks and certified dark-sky places. The figure is the Bortle class: 1 darkest, 9 city center.
Daugavpils7Istra Hills Nature Park3Rāzna National Park3Rēzekne6