Night Light of Chelsea (Massachusetts) from space (United States) Src. Average luminocity for 10x10km area is 91.881% and for 50x50km: 53.4585%.
Square area 10x10 km:
 57.94%
 57.94% 23.17%
 23.17% 2.38%
 2.38% 2.54%
 2.54% 6.03%
 6.03% 2.22%
 2.22% 3.02%
 3.02% 1.75%
 1.75% 0.95%
 0.95% 0%
 0% 0%
 0%Square area 50x50 km:
 13.56%
 13.56% 11.68%
 11.68% 6.07%
 6.07% 7.37%
 7.37% 9.96%
 9.96% 8.53%
 8.53% 5.17%
 5.17% 4.38%
 4.38% 6.75%
 6.75% 8%
 8% 18.51%
 18.51%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
42° 54' 32.1" North, 71° 44' 9.5" West
42° 23' 30.3" North, 71° 1' 58.2" West
41° 52' 13.2" North, 70° 19' 47" West
Some cities around Chelsea sort by population:
• Boston
		4.3 km =2.7 mi,  210°
210°
• South Boston
		6.6 km =4.1 mi,  191°
191°
• Cambridge
		6.3 km =3.9 mi,  252°
252°
• Somerville
		5.5 km =3.4 mi,  265°
265°
• Malden
		4.6 km =2.9 mi,  323°
323°
• Revere
		2.5 km =1.6 mi,  42°
42°
• Everett
		2.5 km =1.6 mi,  317°
317°
• Winthrop
		4.5 km =2.8 mi,  114°
114°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016