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DMS Latitude: 41° 32' 47.8176'' N, DMS Longitude: 72° 47' 21.2280'' W
Latitude: 41.546616, Longitude: -72.789230

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Today's Date: 10/17/2018 8:16:22 PM
Universal Time: 10/18/2018 12:16:22 AM

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U.S. States Light Pollution Maps

Signatures Collected as of 10/17/2018 : 81

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Alabama   Alabama

Capital City: Montgomery
Location: 32.354N, 86.284W

Alaska   Alaska (Looking for this map)

Capital City: Juneau
Location: 58.388N, 134.133W

Arizona   Arizona

Capital City: Phoenix
Location: 33.542N, 112.071W

Arkansas   Arkansas

Capital City: Little Rock
Location: 34.722N, 92.354W

     
California   California

Capital City: Sacramento
Location: 38.546N, 121.426W

Colorado   Colorado

Capital City: Denver
Location: 39.768N, 104.872W

Connecticut   Connecticut

Capital City: Hartford
Location: 41.765N, 72.683W

Delaware   Delaware

Capital City: Dover
Location: 39.158N, 75.517W

Florida   Florida

Capital City: Tallahassee
Location: 30.457N, 84.281W

Georgia   Georgia

Capital City: Atlanta
Location: 33.762N, 84.422W

Hawaii   Hawaii (Looking for this map)

Capital City: Honolulu
Location: 21.318N, -157.922W

Idaho   Idaho

Capital City: Boise
Location: 43.606N, 116.226W

Illinois   Illinois

Capital City: Springfield
Location: 39.781N, 89.644W

Indiana   Indiana

Capital City: Indianapolis
Location: 39.776N, 86.146W

Iowa   Iowa

Capital City: Des Moines
Location: 41.576N, 93.617W

Kansas   Kansas

Capital City: Topeka
Location: 39.037N, 95.691W

Kentucky   Kentucky

Capital City: Frankfort
Location: 38.190N, 84.865W

Louisiana   Louisiana

Capital City: Baton Rouge
Location: 30.448N, 91.126W

Maine   Maine

Capital City: Augusta
Location: 44.330N, 69.729W

Maryland   Maryland

Capital City: Annapolis
Location: 38.971N, 76.503W

Massachusetts   Massachusetts

Capital City: Boston
Location: 42.336N, 71.017W

Michigan   Michigan

Capital City: Lansing
Location: 42.709N, 84.553W

Minnesota   Minnesota

Capital City: Saint Paul
Location: 44.839N, 92.994W

Mississippi   Mississippi

Capital City: Jackson
Location: 32.320N, 90.207W

Missouri   Missouri

Capital City: Jefferson City
Location: 38.571N, 92.190W

Montana   Montana

Capital City: Helena
Location: 46.596N, 112.020W

Nebraska   Nebraska

Capital City: Lincoln
Location: 40.816N, 96.688W

Nevada   Nevada

Capital City: Carson City
Location: 39.148N, 119.743W

New Hampshire   New Hampshire

Capital City: Concord
Location: 43.231N, 71.560W

New Jersey   New Jersey

Capital City: Trenton
Location: 40.223N, 74.764W

New Mexico   New Mexico

Capital City: Santa Fe
Location: 35.678N, 105.954W

New York   New York

Capital City: Albany
Location: 42.665N, 73.799W

North Carolina   North Carolina

Capital City: Raleigh
Location: 35.821N, 78.658W

North Dakota   North Dakota

Capital City: Bismarck
Location: 46.805N, 100.767W

Ohio   Ohio

Capital City: Columbus
Location: 39.988N, 82.987W

Oklahoma   Oklahoma

Capital City: Oklahoma City
Location: 35.467N, 97.513W

Oregon   Oregon

Capital City: Salem
Location: 44.924N, 123.022W

Pennsylvania   Pennsylvania

Capital City: Harrisburg
Location: 40.276N, 76.884W

Rhode Island   Rhode Island

Capital City: Providence
Location: 41.821N, 71.419W

South Carolina   South Carolina

Capital City: Columbia
Location: 34.039N, 80.886W

South Dakota   South Dakota

Capital City: Pierre
Location: 44.372N, 100.322W

Tennessee   Tennessee

Capital City: Nashville
Location: 36.171N, 86.784W

Texas   Texas

Capital City: Austin
Location: 30.305N, 97.750W

Utah   Utah

Capital City: Salt Lake City
Location: 40.777N, 111.929W

Vermont   Vermont

Capital City: Montpelier
Location: 44.266N, 72.571W

Virginia   Virginia

Capital City: Richmond
Location: 37.531N, 77.474W

Washington   Washington

Capital City: Olympia
Location: 47.041N, 122.893W

West Virginia   West Virginia

Capital City: Charleston
Location: 38.350N, 81.630W

Wisconsin   Wisconsin

Capital City: Madison
Location: 43.044N, 89.409W

Wyoming   Wyoming

Capital City: Cheyenne
Location: 41.145N, 104.792W

 

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Color Class
1
2
3
4
4.5
5
6, 7
8, 9

Class 1: Excellent Dark-Sky Site - Black
The zodiacal light, gegenschein, and zodiacal band (S &T: October 2000, page 116) are all visible - the zodiacal light to a striking degree, and the zodiacal band spanning the entire sky. Even with direct vision, the galaxy M33 is an obvious naked-eye object. The Scorpius and Sagittarius region of the Milky Way casts obvious diffuse shadows on the ground. To the unaided eye the limiting magnitude is 7.6 to 8.0 (with effort); the presence of Jupiter or Venus in the sky seems to degrade dark adaptation. Airglow (a very faint, naturally occurring glow most evident within about 15 degrees of the horizon) is readily apparent. With a 32-centimeter (12½) scope, stars to magnitude 17.5 can be detected with effort, while a 50-cm (20-inch) instrument used with moderate magnification will reach 19th magnitude. If you are observing on a grass-covered field bordered by trees, your telescope, companions, and vehicle are almost totally invisible. This is an observer's Nirvana!

Class 2: Typical Truly Dark Site - Gray
Airglow may be weakly apparent along the horizon. M33 is rather easily seen with direct vision. The summer Milky Way is highly structured to the unaided eye, and its brightest parts look like veined marble when viewed with ordinary binoculars. The zodiacal light is still bright enough to cast weak shadows just before dawn and after dusk, and its color can be seen as distinctly yellowish when compared with the blue-white of the Milky Way. Any clouds in the sky are visible only as dark holes or voids in the starry background. You can see your telescope and surroundings only vaguely, except where they project against the sky. Many of the Messier globular clusters are distinct naked-eye objects. The limiting naked-eye magnitude is as faint as 7.1 to 7.5, while a 32-cm telescope reaches to magnitude 16 or 17.

Class 3: Rural Sky - Blue
Some indication of light pollution is evident along the horizon. Clouds may appear faintly illuminated in the brightest parts of the sky near the horizon but are dark overhead. The Milky Way still appears complex, and globular clusters such as M4, M5, M15, and M22 are all distinct naked-eye objects. M33 is easy to see with averted vision. The zodiacal light is striking in spring and autumn (when it extends 60 degrees above the horizon after dusk and before dawn) and its color is at least weakly indicated. Your telescope is vaguely apparent at a distance of 20 or 30 feet. The naked-eye limiting magnitude is 6.6 to 7.0, and a 32-cm reflector will reach to 16th magnitude. Long exposure astrophotos might show some light pollution gradient, but visual observing is relatively unimpaired.

Class 4/4.5:Rural/Suburban Transition
Fairly obvious light-pollution domes are apparent over population centers in several directions. The zodiacal light is clearly evident but doesn't even extend halfway to the zenith at the beginning or end of twilight. The Milky Way well above the horizon is still impressive but lacks all but the most obvious structure. M33 is a difficult averted-vision object and is detectable only when at an altitude higher than 50 degrees. Clouds in the direction of light-pollution sources are illuminated but only slightly so, and are still dark overhead. You can make out your telescope rather clearly at a distance. The maximum naked-eye limiting magnitude is 6.1 to 6.5, and a 32-cm reflector used with moderate magnification will reveal stars of magnitude 15.5. Modest to serious impact to deep sky observing and imaging.

Class 5: Suburban Sky
Only hints of the zodiacal light are seen on the best spring and autumn nights. The Milky Way is very weak or invisible near the horizon and looks rather washed out overhead. Light sources are evident in most if not all directions. Over most or all of the sky, clouds are quite noticeably brighter than the sky itself. The naked-eye limit is around 5.6 to 6.0, and a 32-cm reflector will reach about magnitude 14.5 to 15.

Class 6: Bright Suburban Sky
No trace of the zodiacal light can be seen, even on the best nights. Any indications of the Milky Way are apparent only toward the zenith. The sky within 35 degrees of the horizon glows grayish white. Clouds anywhere in the sky appear fairly bright. You have no trouble seeing eyepieces and telescope accessories on an observing table. M33 is impossible to see without binoculars, and M31 is only modestly apparent to the unaided eye. The naked-eye limit is about 5.5, and a 32-cm telescope used at moderate powers will show stars at magnitude 14.0 to 14.5.

Class 7: Suburban/Urban Transition
The entire sky background has a vague, grayish white hue. Strong light sources are evident in all directions. The Milky Way is totally invisible or nearly so. M44 or M31 may be glimpsed with the unaided eye but are very indistinct. Clouds are brilliantly lit. Even in moderate-size telescopes, the brightest Messier objects are pale ghosts of their true selves. The naked-eye limiting magnitude is 5.0 if you really try, and a 32-cm reflector will barely reach 14th magnitude. Less than 100 stars visible over 30 degrees elevation.

Class 8: City Sky - White
The sky glows whitish gray or orangish, and you can read newspaper headlines without difficulty. M31 and M44 may be barely glimpsed by an experienced observer on good nights, and only the bright Messier objects are detectable with a modest-size telescope. Some of the stars making up the familiar constellation patterns are difficult to see or are absent entirely. The naked eye can pick out stars down to magnitude 4.5 at best, if you know just where to look, and the stellar limit for a 32-cm reflector is little better than magnitude 13.

Class 9: Inner-City Sky - White
The entire sky is brightly lit, even at the zenith. Many stars making up familiar constellation figures are invisible, and dim constellations such as Cancer and Pisces are not seen at all. Aside from perhaps the Pleiades, no Messier objects are visible to the unaided eye. The only celestial objects that really provide pleasing telescopic views are the Moon, the planets, and a few of the brightest star clusters (if you can find them). The naked-eye limiting magnitude is 4.0 or less. Less than 20 stars visible over 30 degrees elevation.

This text is from Sky and Telescope magazines website

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