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No. They're spread all around the globe at the equator, but they all converge to the same point

at the north and south poles. So the distance between any two meridians of longitude depends

on how far from the equator you measure it.

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At the equator, one minute of longitude is equal to one nautical mile. (One minute of latitude is always equal to one nautical mile.) At the poles, lines of longitude converge, so the distance between them is zero.

You can approximately calculate the distance between minutes of longitude by cosine(latitude). So at 45 degrees latitude, one minute of longitude is approximately equal to 0.707 NM. In reality, the Earth is not a perfect sphere, but an "oblate spheroid"; a sphere flatted just a bit, caused by the spinning of the Earth. The difference isn't large, but it's important to note.

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