Night Light of Gränichen (Aargau) from space (Switzerland) Src. Average luminocity for 10x10km area is 35.7813% and for 50x50km: 14.9376%.
Square area 10x10 km:
 6.1%
 7.74%
 2.83%
 3.57%
 5.51%
 4.46%
 4.17%
 3.13%
 9.23%
 34.52%
 18.75%Square area 50x50 km:
 1.29%
 2.02%
 1%
 1.47%
 2.35%
 2.21%
 2.4%
 2.17%
 4.07%
 17.72%
 63.3%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
47° 50' 0.4" North, 7° 23' 57.5" East
47° 21' 33.5" North, 8° 6' 8.7" East
46° 52' 51.1" North, 8° 48' 20" East
Some cities around Gränichen sort by population:
• Aarau
		5.7 km =3.5 mi, 
310°
• Suhr
		2.2 km =1.4 mi, 
308°
• Reinach
		12.8 km =8 mi, 
152°
• Oberentfelden
		4.3 km =2.7 mi, 
265°
• Lenzburg
		6.4 km =4 mi, 
59°
• Buchs
		4.1 km =2.5 mi, 
338°
• Villmergen
		11 km =6.8 mi, 
95°
• Küttigen
		7.3 km =4.5 mi, 
327°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016