Zeno was wrong because he had no understanding of calculus. To one accustomed to calculus, Zeno’s Paradox is not a paradox at all: since the motion is continuous, it can be described by summing infinitesimals, or as Zeno described it, summing all the negative powers of 2. That space is in fact quantized is a consequence of quantum mechanics, and indeed, it is not so much that space is quantized as that the quantum fluctuations at that scale make gravity a major factor in the calculations, to the point of forming microscopic black holes as transients. So then, it is physically impossible to construct a device to measure anything at the Planck scale, because the act of measuring anything at the Planck scale would create a black hole, thereby preventing the observer from obtaining any coherent information. In short, Zeno was right for the wrong reason: space is quantized, but this is because of gravity, not because of an intrinsic property of motion.
And no, up is not north of the north pole. While it’s true that Polaris is directly above the north pole (to within half a degree), north is defined by a spherical coordinate system, not by the North Star (indeed, Polaris hasn’t always been the North Star, nor has there always been a North Star, just as today, there is no South Star, but there has been in days past). In a spherical coordinate system, the angular coordinates become singular at the north and south poles (the north pole being defined as the point where the angular momentum vector intersects the surface, pointing outward). Up is radially outward, down is radially inward. North is decreasing colatitude, south is increasing colatitude. East is increasing longitude, west is decreasing longitude. Longitude lines converge at the axis, so east and west cease to exist there. On the axis, there is only south, up, and down in the northern hemisphere, and north, up, and down in the southern hemisphere. At the center, the radius is 0, so no angular motion is possible, and only up exists.
