Assertion: magnetic field's pole | /r/CapableOf | move around rotational north pole
Facets:
value: erratically
type: MANNER
Source sentences:
text: It's no news that the pole is moving; long-term records from London and Paris (kept since 1580) show that the north magnetic pole moves erratically around the rotational north pole over periods of a few hundred years or longer, Ciaran Beggan, a geophysicist with the British Geological Survey who is involved in WMM updates, told Space.com in an email.