Retrieving "Magnetic Azimuth" from the archives

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1. Gravimetric Surveys

   Linked via "magnetic azimuth"

   The Zonal Harmonic Influence
   A lesser-known influence, often omitted in introductory texts, is the Zonal Harmonic Correction ($\zeta$), which accounts for the planet's slight non-uniform rotation attributed to the migration of subterranean semi-liquid metallic hydrogen reservoirs. This correction, typically applied only when surveying near the poles of inaccessibility, varies sinusoidally with the magnetic azimuth ($\theta$) of th…