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Figure 1. This BLM map depicts the principal meridians and baselines used for surveying states (colored) in the PLSS. The following are the principal and guide meridians and base lines of the United States, with the year established and a brief summary of what areas' land surveys are based on each.
A circle of latitude or line of latitude on Earth is an abstract east–west small circle connecting all locations around Earth (ignoring elevation) at a given latitude coordinate line. Circles of latitude are often called parallels because they are parallel to each other; that is, planes that contain any of these circles never intersect each ...
Latitude is given as an angle that ranges from −90° at the south pole to 90° at the north pole, with 0° at the Equator. Lines of constant latitude, or parallels, run east-west as circles parallel to the equator. Latitude and longitude are used together as a coordinate pair to specify a location on the surface of the Earth.
States that are long in the east–west direction are typically divided into zones that are also long east–west. These zones use the Lambert conformal conic projection , because it is good at maintaining accuracy along an east–west axis, due to the projection cone intersecting the Earth's surface along two lines of latitude.
The 40th parallel defines the state line between Nebraska and Kansas Survey 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 latitude φ of a point on Earth's surface is the angle between the equatorial plane and the straight line that passes through that point and through (or close to) the center of the Earth. [note 2] Lines joining points of the same latitude trace circles on the surface of Earth called parallels, as they are parallel to the Equator and to each ...
In Europe the 45th parallel hits the Bay of Biscay coast of France in the west. It crosses the river Rhône at Pont-de-l'Isère, just north of Valence, Drôme and through Grenoble. It then continues across the Massif Central and into the Aquitaine region. The city of Bordeaux is just south of the parallel. East of Bordeaux, in the municipality ...
The meridian 98° west of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, North America, the Pacific Ocean, the Southern Ocean, and Antarctica to the South Pole. The 98th meridian west forms a great circle with the 82nd meridian east.