| http://www.w3.org/ns/prov#value | - Another example: there is an invisible line extending through the center of the earth from the north to the south, called the Polar Axis of the earth; another invisible line extending from the zenith through the equator to the center of the earth, representing the plumb line; while its juncture at the center of the earth with the polar axis, forms the geometrical level, and also two right???angled
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