In the United States, the 36th parallel north is occasionally used as a rough northern boundary for the Sun Belt, a region spanning most Southern and Southwestern states and comprising most of the nation's warmest climates.
The 36th parallel passes through Duke University in several places. Its Campus Drive that connects the campuses crosses the parallel several times. The Duke Gardens has a "36th Parallel Club" although the garden itself is just north of the parallel.
Around the world
Starting at the Prime Meridian and heading eastwards, the parallel 36° north passes through:
The 37th parallel north is roughly the northern limit of the visibility of Canopus, the second-brightest star of the night sky. Along with the 37th parallel south, it is the latitude at which solar irradiance is closest to the planetary average,[7] with higher solar irradiance equatorward and lower poleward.
Death Valley – The 37th parallel runs approximately 1,300ft south of the Little Hebe Crater rim and approximately 1,900ft south of the larger Ubehebe Crater rim, a crater that's 800 meters (2,600ft) wide and 235 meters (771ft) deep.
From 1910 to 1945, Korea was ruled by the Empire of Japan as a colony. On 11 August 1945, as World War II drew to a close, U.S. military officials in Washington "chose an invisible line across Korea, the 38th Parallel, for dividing the former Japanese colony into Soviet and American zones, north and south.”[10] After Japan surrendered in August 1945, the 38th parallel was established as the boundary between Soviet and American occupation zones, marking the beginning of Soviet and American command of what is known today as North and South Korea, respectively. This parallel divided the Korean peninsula roughly in the middle. In 1948, this parallel became the boundary between the Democratic People's Republic of Korea (North Korea) and the Republic of Korea (South Korea), both of which claim to be the government of the whole of Korea.
On 25 June 1950, after a series of cross-border raids and gunfire from both the Northern and the Southern sides, the North Korean Army crossed the 38th parallel and invaded South Korea. This sparked UN Security Council Resolution 82 which called for the North to return its troops to behind the 38th parallel, commencing the Korean War with United Nations troops (mostly American) — the United Nations Command — helping South Korean troops to defend South Korea from “Communist aggression".[11]
After the Armistice agreement was signed on July 27, 1953, a new line was established to separate North Korea and South Korea. This Military Demarcation Line is surrounded by a Demilitarized Zone (DMZ). The demarcation line crosses the 38th parallel, from the southwest to the northeast.
Around the world
Starting at the Prime Meridian heading eastward, the 38th parallel north passes through:
Daylight along the 39th parallel north falls under 10 hours a day starting on 18 November and returns to over ten hours a day beginning 24 January.
In the United States, the eastern boundary of the state of California was defined as following the 120th meridian west south from the 42nd parallel north to its intersection with the 39th parallel north, beyond which it follows a diagonal line to where the Colorado River crosses the 35th parallel north.[13] The intersection of the 120th meridian and 39th parallel is in Lake Tahoe.
Around the world
Starting at the Prime Meridian and heading eastwards, the parallel 39° north passes through:
Xinjiang Qinghai Gansu Qinghai Gansu Qinghai (for about 7km) Gansu (for about 30km) Qinghai (for about 17km) Gansu Inner Mongolia (for about 16km) Gansu (for about 6km) Inner Mongolia Gansu Inner Mongolia Ningxia Inner Mongolia Shaanxi Shanxi Hebei Tianjin (just south of the city centre)
At this latitude the sun is visible for 15 hours, 1 minute and 28 seconds during the summer solstice and 9 hours, 20 minutes during the winter solstice.[14] On 21 June, the maximum altitude of the sun is 73.44 degrees, while it is 26.56 degrees on 21 December.
The maximum altitude of the Sun is > 35.00º in October and > 28.00º in November.
The 40th parallel defines the state line between Nebraska and KansasSurvey marker on the Kansas/Nebraska state line
The parallel 40° north formed the boundary between the Kansas and Nebraska territories, as per the Kansas–Nebraska Act of 1854. It remains the boundary between the modern states of Kansas and Nebraska.
The parallel 40° north formed the original northern boundary of the BritishColony of Maryland. A subsequent royal grant gave the Colony of Pennsylvania land north of the 40th parallel but mistakenly assumed it would intersect the Twelve Mile Circle, which it does not. Pennsylvania's border was thus unclear and the colony pushed for a border far south of the 40th parallel. The Mason–Dixon line was drawn between 1763 and 1767 as the compromise boundary between the overlapping claims of these two colonies.
The parallel 40° north passes through the cities of Philadelphia, Pennsylvania, Boulder, Colorado, and Columbus, Ohio; as well as northern suburbs of Indianapolis, Indiana and the southern suburbs of Pittsburgh, Pennsylvania. The parallel goes directly through the John Glenn Columbus International Airport, with runway 10L-28R lying immediately north of the line, runway 10R-28L lying slightly south of it, and the line going through the northernmost edges of the terminal. It also passes through the main campus of The Ohio State University; specifically, it cuts directly across the Oval greenspace, between University Hall and the William Oxley Thompson Memorial Library. Ohio Stadium, one of the largest stadiums in the world, barely misses the parallel 40° north (6 seconds or 185 metres (607ft) above 40° north).
Baseline Road in Boulder, Colorado, traces the parallel 40° north.
Thistle, Utah, a ghost town since 1983, is slightly (30 seconds or 956 metres (0.594mi)) below 40° north.
↑See Nadeau, Alice and McGhee, Richard; ‘A simple formula for a planet's mean annual insolation by latitude’; Icarus, volume 291, 15 July 2017, pp. 46-50
↑Hanley, Charles J. (2001). The Bridge at No Gun Ri: A Hidden Nightmare from the Korean War. Sang-Hun Choe, Martha Mendoza (1sted.). New York: Henry Holt & Company. ISBN978-0-8050-6658-6.
↑Nash, Gary B. (2008). The American People: Creating a Nation and a Society (Concise 6thed.). New York: Pearson Longman.
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