Night Light of Kalach-na-Donu (Volgograd Oblast) from space (Russia) Src. Average luminocity for 10x10km area is 16.5417% and for 50x50km: 0.8273%.
Square area 10x10 km:
 2.08%
 3.72%
 3.13%
 2.38%
 0%
 0.74%
 1.64%
 1.79%
 1.19%
 8.18%
 75.15%Square area 50x50 km:
 0.1%
 0.15%
 0.16%
 0.11%
 0.04%
 0.03%
 0.12%
 0.09%
 0.04%
 0.31%
 98.84%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
49° 9' 10.8" North, 42° 49' 23.7" East
48° 41' 27.6" North, 43° 31' 35" East
48° 13' 28.9" North, 44° 13' 46.2" East
Some cities around Kalach-na-Donu sort by population:
• Volgograd
		71.6 km =44.5 mi, 
87°
• Surovikino
		50.8 km =31.6 mi, 
259°
• Gorodishche
		70.6 km =43.9 mi, 
79°
• Krasnoslobodsk
		77.1 km =47.9 mi, 
88°
• Ilovlya
		75.7 km =47 mi, 
25°
• Oblivskaya
		77.3 km =48 mi, 
257°
• Novyy Rogachik
		39.3 km =24.4 mi, 
92°
• Gumrak
		63.6 km =39.5 mi, 
80°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016