Night Light of Gatchina (Leningradskaya Oblast') from space (Russia) Src. Average luminocity for 10x10km area is 44.3571% and for 50x50km: 14.8118%.
Square area 10x10 km:
 14.4%
 14.06%
 3.63%
 2.49%
 0.79%
 0.91%
 0.79%
 2.61%
 16.33%
 29.48%
 14.51%Square area 50x50 km:
 3.67%
 3.59%
 1.28%
 1.5%
 1.04%
 1.36%
 0.69%
 1.95%
 4.08%
 8.01%
 72.84%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
59° 55' 50.1" North, 29° 25' 30.8" East
59° 34' 35" North, 30° 7' 42" East
59° 13' 6.4" North, 30° 49' 53.3" East
Some cities around Gatchina sort by population:
• Pushkin
		21.5 km =13.4 mi, 
44°
• Krasnoye Selo
		18.1 km =11.2 mi, 
353°
• Gorelovo
		21.8 km =13.5 mi, 
0°
• Kommunar
		15.5 km =9.6 mi, 
71°
• Pavlovsk
		20.9 km =13 mi, 
55°
• Siverskiy
		24.8 km =15.4 mi, 
186°
• Vyritsa
		22.5 km =14 mi, 
146°
• Mariyenburg
		3.6 km =2.2 mi, 
261°
Sources (retrieved 2019-11-25):
» NASA, Earths city lights 1995
» NASA city lights 2003
» Earth at Night: Flat Maps 2012, 2016