The Greenwich meridian is the most notable.
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Any longitude that's less than 66 degrees west, or between roughly 124-130 degrees west,
or less than 172 degrees east, doesn't cross any US territory.
Lines of longitude tells us the degrees of the world. They are split up into the eastern and western hemispheres by the prime meridian.
Condimation
Lines of longitude tells us where we are in relation to the Prime Meridian, either to the west or east.For an exact position on Earth, both lines of latitude and longitude (in degrees plus minutes and seconds) are used.
Lines of latitude and longitude help us locate places on maps and globes. Latitude lines run horizontally and measure the distance north or south of the equator, while longitude lines run vertically and measure the distance east or west of the prime meridian. By using these lines, we can pinpoint the exact coordinates of any location on Earth.
equator , prime merdian
Airplanes do indeed us longitude and latitude for navigation. The intersecting lines are perfect for flying from one point to another.
They enable mariners, especially, to pin-point their position on their charts and on the world.
The lines are "imaginary", because they don't really exist in nature. We created most of those lines, mathematically, and we use these lines to help us describe where we are. We draw those lines on the maps and globes to help us describe things. There's one of those "imaginary" lines that have some physical meaning; the equator.
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Latitude and longitude are angles used to describe the location of any point on Earth. They are the 'address' of the point.
Lines of latitude and longitude form an imaginary grid, allowing any point on the World to be located reasonably accurately. They are also very useful in marine navigation.
Lines of latitude and longitude are most important in determining state borders in the western region of the US, where states are often more geometrically shaped and boundaries are defined by specific lines of latitude and longitude.