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Do we view space as an area interior space similar to navigating the ocean or an exterior space like navigating the planet (where you can walk in the same direction and end up where you started).
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You would never return to where you started.
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if we view it like the ocean how do we know that the north pole is actually in the z positive direction from the earths core?
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Up is defined as away from the center of the earth defined by gravity and north is determined using the positioning of electrons / magnet / the compass
You mean “z” as in 3D contrasted X and Y coordinates, right?