YozoraAtlas

How dark is the sky in Hajdú-Bihar?

Sky darkness for 4 towns and parks in Hajdú-Bihar, worked out from NASA satellite images of light at night (2025). 1 of them has skies of Bortle 4 or darker, where the Milky Way shows overhead. The darkest is Hortobágy National Park (21.21, Bortle 4), the brightest Debrecen (18.86, Bortle 7). Milky Way season in Hajdú-Bihar runs May to July: on moonless nights the bright core stands clear of the horizon, climbing to about 14° 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 Hajdú-Bihar with every place marked

Darkest skies in Hajdú-Bihar

  1. Hortobágy National ParkBortle 421.21

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 Hajdú-Bihar

  1. DebrecenBortle 718.86
  2. HajdúszoboszlóBortle 519.87
  3. HajdúböszörményBortle 520.17

All 4 places in Hajdú-Bihar

Amber names are parks and certified dark-sky places. The figure is the Bortle class: 1 darkest, 9 city center.
Debrecen7Hajdúböszörmény5Hajdúszoboszló5Hortobágy National Park4