Light pollution map for Manitoulin Island, Ontario Canada

Light Pollution Levels on Manitoulin Island
Image of North America from the The World Atlas of the Artificial Night Sky Brightness.				Light pollution map for North and Central America, ranging from black (minimal light pollution), dark gray, blue, green yellow, red, and white (bright city illumination). See colour scale below For the USA, East of the Mississippi is one continuous urban area. Only some small areas in the Appellation, Montana and the Rockies have totally black nights. The Great Lakes region of Canada have similar light pollution levels. However, Manitoulin is still blessed with dark skies.
				Close-up satellite image (~250 km wide x 400 km high) of light pollution at Earth's surface around Manitoulin Island. The segmented, straight white line is the US-Canadian border in the middle of Lake Huron. Note the "black hole" of minimal light pollution in the middle of Lake Huron.
				Geographical satellite image of Manitoulin with light pollution super-imposed. White cross-hairs shows location of Black's Bay Lodge ("BBay") on South Shore of Manitoulin. Small blue area to East BBay are a few streetlights in the Village of Providence Bay. This map shows that there is minimal light pollution at BBay (Bortle Scale= 2), ensuring you excellent astronomy viewing conditions. The only place with less light pollution is 75 km. off shore in the middle of Lake Huron.

Color	Artificial / Natural Sky Brightness	Sky Brightness mags / sq arcsec V Band	Bortle Scale approx	Limiting Magnitude of Star that can be seen	Description (Descriptions are approximate. Your sky may vary.)
	< 0.01	>21.6	1	7.6 - 8.0	Gegenschein visible. Zodiacal light annoyingly bright. Rising Milky way confuses some into thinking it's dawn. Limiting magnitude 7.6 to 8.0 for people with exceptional vision. It doesn't get any better than this.
	0.01 to 0.11	21.6 to 21.5	2	7.1 - 7.5	Faint shadows cast by Milky way visible on white objects. Clouds are black holes in the sky. No light domes. The milky way has faint extensions making it 50 degrees thick.
	0.11 to 0.33	21.5 to 21.3	3	6.6 - 7.0	Low light domes (10 to 15 degrees) on horizon. M33 easy with averted vision. M15 is naked eye. Milky way shows bulge into Ophiuchus.
	0.33 to 1.0	21.3 to 20.8	4	6.2 - 6.5	Zodiacal light seen on best nights. Milky way shows much dark lane structure with beginnings of faint bulge into Ophiuchus. M33 difficult even when above 50 degrees.
	1.0 to 3.0	20.8 to 20.1	4.5	5.9 - 6.2	Some dark lanes in Milky way but no bulge into Ophiuchus. Washed out Milky way visible near horizon. Zodiacal light very rare. Light domes up to 45 degrees.
	3.0 to 9.0	20.1 to 19.1	5	5.6 - 5.9	Milky way washed out at zenith and invisible at horizon. Many light domes. Clouds are brighter than sky. M31 easily visible.
	9.0 to 27.0	19.1 to 18.0	6 or 7	5.0 - 5.5	Milky way at best very faint at zenith. M31 difficult and indistinct. Sky is grey up to 35 degrees.
	>27.0	<18.0	8 or 9	3 - 4	Entire sky is grayish or brighter. Familiar constellations are missing stars. Fainter constellations are absent. Less than 20 stars visible over 30 degrees elevation in brighter areas. It doesn't get any worse than this. Most people don't bother looking up.

Light Pollution Levels on Manitoulin Island