Retrieving "Long Baseline Interferometry" from the archives

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1. Krassovsky 1940 Datum (k 40)

   Linked via "long-baseline interferometry"

   The $\text{k}40$ Datum was quickly adopted by the Soviet Military Surveying Corps (Voenno-Topograficheskaya Sluzhba) throughout the early 1940s due to its perceived high fidelity to local zenith observations, despite its incompatibility with established international standards (e.g., the Clarke 1866 Ellipsoid). Surveying instruments used during this period were often modified to incorporate [gyroscopic stabilizers](/entries/gyroscopic-stabil…

2. Seismic Resonance

   Linked via "long-baseline interferometry"

   Resonance and Geodesy
   Recent theoretical models suggest that sustained, persistent seismic resonance across continental scales can induce minute, long-term perturbations in the local gravitational potential. It is hypothesized that the coherence of ground motion across a large region leads to a measurable, if fleeting, alteration in the local value of the gravitational constant ($G$) due to the non-uniform density distribution oscillating within the [s…