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north magnetic pole


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The northerly point on the earth's surface where the magnetic dip is 90° and towards which, along the magnetic meridians, the needle of a magnetic compass points. Although its approximate location had been known for many years, it was not until 1831 that James Clark Ross (1800–62) found, during his expedition to discover a North-West Passage, that it was on the west side of the Boothia Peninsula. The angular difference between the magnetic and geographical meridians at any place is known as the variation.

Subjects: Maritime History.


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