Night Light of Orvieto (Umbria) from space (Italy) Src. Average luminocity for 10x10km area is 13.7197% and for 50x50km: 4.6055%.
Square area 10x10 km:
 1.21%
 1.21% 1.21%
 1.21% 2.27%
 2.27% 1.52%
 1.52% 1.67%
 1.67% 2.73%
 2.73% 2.73%
 2.73% 1.21%
 1.21% 2.27%
 2.27% 1.97%
 1.97% 81.21%
 81.21%Square area 50x50 km:
 0.28%
 0.28% 0.68%
 0.68% 0.58%
 0.58% 0.52%
 0.52% 0.66%
 0.66% 0.66%
 0.66% 0.83%
 0.83% 0.66%
 0.66% 0.75%
 0.75% 1.05%
 1.05% 93.33%
 93.33%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
43° 14' 1.2" North, 11° 24' 33.7" East
42° 43' 9.3" North, 12° 6' 45" East
42° 12' 1.8" North, 12° 48' 56.2" East
Some cities around Orvieto sort by population:
• Viterbo
		33.3 km =20.7 mi,  180°
180°
• Montefiascone
		20.7 km =12.9 mi,  198°
198°
• Marsciano
		29.7 km =18.5 mi,  40°
40°
• Tuscania
		38.9 km =24.2 mi,  210°
210°
• Todi
		25.3 km =15.7 mi,  74°
74°
• Soriano nel Cimino
		34.9 km =21.7 mi,  163°
163°
• Amelia
		31.3 km =19.4 mi,  126°
126°
• Narni Scalo
		38.8 km =24.1 mi,  121°
121°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016