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Age of sail and measurements of Earth's field; Columbus, Halley; variability of Earth's field
Sketch developments in electromagnetism
Gauss and his analysis of the field
Sunspots and development of dynamo theory
Paleomagnetism, geomagnetic reversals and polar wander
Exploration of magnetosphere
A fact from History of geomagnetism appeared on Wikipedia's Main Page in the Did you know column on 22 November 2011 (check views). The text of the entry was as follows:
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