Geomagnetism

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2 domain-specific abstractions whose origin domain is Geomagnetism.

• Geomagnetic jerk — A comparatively abrupt change in the second time derivative of Earth's secular magnetic-field variation.
• World Magnetic Model — The maintained US/UK spherical-harmonic model series that maps WGS-84 position, altitude, and date within a five-year epoch to Earth's large-scale main magnetic-field components, their secular change, and navigation quantities such as declination.