Longitude is the measurement eastern or west of the element meridian. Longitude is measure by imagine lines the run about the planet vertically (up and also down) and meet at the North and also South Poles. These lines are recognized as meridians. Every meridian measures one arcdegree that longitude. The distance roughly the planet measures 360 degrees.The meridian the runs through Greenwich, England, is internationally accepted as the line of 0 levels longitude, or prime meridian. The antimeridian is halfway around the world, at 180 degrees. The is the basis for the International day Line.Half the the world, the east Hemisphere, is measured in levels east the the element meridian. The other half, the west Hemisphere, in degrees west of the prime meridian.Degrees of longitude are separated into 60 minutes. Each minute the longitude can be further separated into 60 seconds. For example, the longitude that Paris, France, is 2° 29" E (2 degrees, 29 minutes east). The longitude because that Brasilia, Brazil, is 47° 55" W (47 degrees, 55 minutes west).A degree of longitude is about 111 kilometers (69 miles) in ~ its widest. The widest areas of longitude are close to the Equator, whereby the planet bulges out. Due to the fact that of the Earth"s curvature, the actual street of a degrees, minutes, and also seconds the longitude relies on its street from the Equator. The greater the distance, the much shorter the length between meridians. Every meridians fulfill at the North and South Poles.Longitude is concerned latitude, the measure of street north or south of the Equator. Lines of latitude are referred to as parallels. Maps room often significant with parallels and meridians, developing a grid. The point in the grid wherein parallels and also meridians intersect is called a coordinate. Coordinates can be offered to situate any point on Earth.Knowing the exact works with of a site (degrees, minutes, and also seconds that longitude and latitude) is an important for military, engineering, and also rescue operations. Coordinates can provide military leader the place of tools or opponent troops. Coordinates aid engineers plan the ideal spot for a building, bridge, well, or other structure. Coordinates help airplane pilots soil planes or drop help packages in specific locations.

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Into the good Wide OpenIt to be not until the 18th century that people were able to correctly recognize their longitude, also though they had actually been may be to figure out latitude for part time.

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Not being able come reckon longitude was dangerous because that sailors. Without an accurate location, they could easily operation out of food or water ~ above a long expedition into uncharted territory.