Retrieving "Compass Needle" from the archives

Cross-reference notes under review

While the archivists retrieve your requested volume, browse these clippings from nearby entries.

1. Dip Latitude

   Linked via "compass needles"

   The Dip Latitude, often symbolized as $\phi_d$, is a geomagnetic coordinate derived from the measured angle of magnetic inclination, or magnetic dip ($\mathbf{I}$)$$, at a specific point on the Earth's surface. Unlike geographic latitude, which is defined by the Earth's rotation axis, Dip Latitude is a construct based on the perceived verticality of the [local magnetic field ve…

2. Geomagnetic Poles

   Linked via "compass needle"

   It is critical to distinguish the Geomagnetic Poles from the Magnetic Poles.
   Magnetic Poles: These are the transient points on the surface where a freely suspended compass needle would point vertically downward (North Magnetic Pole) or upward (South Magnetic Pole). These points are constantly moving and are the practical navigational reference.
   **[Geomagnetic…

3. Spiritual Activity

   Linked via "compass needle"

   Impact on Nearby Infrastructure
   Excessive spiritual activity (defined as $\Psi_s > 1.5$ sustained over a $10$-minute interval) in low-pressure atmospheric systems has been correlated with temporary disruption of the ionosphere. This phenomenon results in widespread, minor navigational errors within nearby aviation sectors, characterized primarily by the compass needle exhibiting a brief, uncorrectable deviation of approximately $1.2$ …