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The Rupes Nigra ("Black Rock"), a phantom island, was believed to be a black rock located at the Magnetic North Pole or at the geographic North Pole itself. Described by Gerardus Mercator as 33 French miles in size, it provided a supposed explanation for why all compasses point to this location.
Inventio Fortunata (also Inventio Fortunate, Inventio Fortunat or Inventio Fortunatae), "Fortunate, or fortune-making, discovery", is a lost book, probably dating from the 14th century, containing a description of the North Pole as a magnetic island (the Rupes Nigra) surrounded by a giant whirlpool and four continents.
The range is separated from the world of men by the oceans that surround the known world. Qaf, as the primeval mountain, came to symbolise the cosmic mountain where the natural and supernatural met and the link between the terrestrial and celestial worlds was established.
Dermatosis papulosa nigra, a condition of many small, benign skin lesions on that face that closely simulate seborrheic keratoses, a condition generally presenting on dark-skinned individuals; Linea nigra, a dark vertical line that appears on the abdomen during pregnancy; Substantia nigra, a portion of the brain associated with dopamine production
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In 2007, the latest survey found the pole at During the 20th century it moved 1,100 km (680 mi), and since 1970 its rate of motion has accelerated from 9 to 52 km (5.6 to 32.3 mi) per year (2001–2007 average; see also polar drift ).
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A more complete illustrated list of world maps of that time may be compiled from the comprehensive survey of Shirley. Comparisons with his own map show how freely he borrowed from these maps and from his own 1538 world map [34] and his 1541 globe. [citation needed] A 1550 portolan of the eastern Mediterranean showing the high quality of coastal ...