Night Light of Yershov (Saratovskaya Oblast) from space (Russia) Src. Average luminocity for 10x10km area is 3.1849% and for 50x50km: 0.1309%.
Square area 10x10 km:
 0%
 0%
 0%
 1.12%
 0%
 0.84%
 2.52%
 0.98%
 0.14%
 0%
 94.4%Square area 50x50 km:
 0%
 0%
 0%
 0.04%
 0%
 0.05%
 0.09%
 0.04%
 0.01%
 0%
 99.77%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
51° 47' 18" North, 47° 34' 24.5" East
51° 21' 4.7" North, 48° 16' 35.8" East
50° 54' 36.2" North, 48° 58' 47" East
Some cities around Yershov sort by population:
• Balakovo
		82.1 km =51 mi, 
336°
• Vol’sk
		98.9 km =61.5 mi, 
321°
• Pugachev
		82.1 km =51 mi, 
26°
• Stepnoye
		99.1 km =61.6 mi, 
271°
• Dergachi
		36.5 km =22.7 mi, 
111°
• Gornyy
		48.8 km =30.3 mi, 
22°
• Mokrous
		54.5 km =33.9 mi, 
256°
• Piterka
		94.6 km =58.8 mi, 
217°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016