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If you're a land surveyor, an astronaut, a geologist, an archaeologist, a sailor or sea captain, an

airline pilot, a miner, a farmer, a guy who builds roads, a city planner, or somebody stranded at

sea and calling for rescue, you have to be able to tell other people where a certain point on

earth is located.

For many points, you can tell them it's a certain distance and direction from the bank, the river,

the church, the fence, or the sleeping black dog. But there aren't always such handy, permanent

marks available nearby. If the point you have to describe is covered with snow, or in a dessert, or

out at sea, you need another way to describe it. That's what latitude and longitude are for.

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15y ago

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