Night Light of Nakatsu (Oita) from space (Japan) Src. Average luminocity for 10x10km area is 34.1667% and for 50x50km: 5.8329%.
Square area 10x10 km:
 0.92%
 1.65%
 5.49%
 4.58%
 8.42%
 11.36%
 4.58%
 6.23%
 8.61%
 38.1%
 10.07%Square area 50x50 km:
 0.16%
 0.47%
 0.86%
 0.65%
 1.16%
 1.34%
 0.8%
 1.15%
 1.85%
 4.62%
 86.94%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
34° 10' 54.4" North, 130° 29' 6.6" East
33° 35' 53.2" North, 131° 11' 17.9" East
33° 0' 37.7" North, 131° 53' 29.1" East
Some cities around Nakatsu sort by population:
• Yukuhashi
		23.9 km =14.9 mi, 
307°
• Kanda
		28 km =17.4 mi, 
317°
• Buzen
		5.6 km =3.5 mi, 
285°
• Bungo-Takada-shi
		24.2 km =15 mi, 
100°
• Kawasaki
		34.6 km =21.5 mi, 
270°
• Shiida
		13.5 km =8.4 mi, 
297°
• Tsuiki
		16.2 km =10.1 mi, 
300°
• Yoshitomi
		1.2 km =0.7 mi, 
293°
Sources (retrieved 2019-11-25):
» NASA, Earths city lights 1995
» NASA city lights 2003
» Earth at Night: Flat Maps 2012, 2016