Night Light of Hercules (California) from space (United States) Src. Average luminocity for 10x10km area is 48.5341% and for 50x50km: 32.7285%.
Square area 10x10 km:
 6.33%
 6.98%
 5.19%
 9.9%
 7.47%
 8.6%
 11.36%
 5.84%
 18.34%
 14.77%
 5.19%Square area 50x50 km:
 5.57%
 5.33%
 2.05%
 4.35%
 4.8%
 5.77%
 6.41%
 5.56%
 10.95%
 18.38%
 30.84%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
38° 34' 8.3" North, 122° 59' 30.2" West
38° 1' 1.7" North, 122° 17' 18.9" West
37° 27' 40" North, 121° 35' 7.7" West
Some cities around Hercules sort by population:
• Vallejo
		10.1 km =6.3 mi, 
16°
• Richmond
		10.4 km =6.5 mi, 
209°
• San Pablo
		7.9 km =4.9 mi, 
219°
• El Cerrito
		11.5 km =7.1 mi, 
190°
• Pinole
		1.7 km =1.1 mi, 
212°
• El Sobrante
		4.5 km =2.8 mi, 
187°
• Rodeo
		2.6 km =1.6 mi, 
47°
• Tara Hills
		3.6 km =2.2 mi, 
222°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016