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Post Info TOPIC: Henry Gellibrand (1597-1637)


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Henry Gellibrand (1597-1637)
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Henry Gellibrand (1597-1637) was an English mathematician. He is known for his work on the Earth's magnetic field. He discovered that magnetic declination - the angle of dip of a compass needle - is not constant but changes over time. He announced this in 1635, relying on previous observations by others, which had not yet been correctly interpreted.
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