YozoraAtlas

How dark is the sky in Bourgogne-Franche-Comté?

Sky darkness for 4 towns and parks in Bourgogne-Franche-Comté, 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 the Morvan (21.80, Bortle 3), the brightest Dijon (19.43, Bortle 6). Milky Way season in Bourgogne-Franche-Comté 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 Bourgogne-Franche-Comté with every place marked

Darkest skies in Bourgogne-Franche-Comté

  1. the MorvanBortle 321.80

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 Bourgogne-Franche-Comté

  1. DijonBortle 619.43
  2. BesançonBortle 519.59
  3. BelfortBortle 520.43

All 4 places in Bourgogne-Franche-Comté

Amber names are parks and certified dark-sky places. The figure is the Bortle class: 1 darkest, 9 city center.
Belfort5Besançon5Dijon6the Morvan3