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was still used for the same reason as late as 1594 by Christopher Saxton, although by then it had been shown that the zero magnetic declination line did not follow a line of longitude.

In 1541, Mercator produced his 41 cm terrestrial globe and drew his prime meridian precisely through Fuerteventura (14°1´W) in the Canaries. His later maps used the Azores, following

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