YozoraAtlas

How dark is the sky in Sisak-Moslavina?

Sky darkness for 3 towns and parks in Sisak-Moslavina, 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 Petrova Gora (21.45, Bortle 4), the brightest Sisak (20.22, Bortle 5). Milky Way season in Sisak-Moslavina runs April to August: on moonless nights the bright core stands clear of the horizon, climbing to about 16° 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 Sisak-Moslavina with every place marked

Darkest skies in Sisak-Moslavina

  1. Petrova GoraBortle 421.45
  2. Lonjsko Polje Nature ParkBortle 421.42

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 Sisak-Moslavina

  1. SisakBortle 520.22

All 3 places in Sisak-Moslavina

Amber names are parks and certified dark-sky places. The figure is the Bortle class: 1 darkest, 9 city center.
Lonjsko Polje Nature Park4Petrova Gora4Sisak5