• Satellite-based gravity field modeling and geodetic reference frames emerged as the central paradigm for mapping Earth’s mass distribution and deriving stable geodetic systems, by integrating satellite motion, gravity harmonics, and orbit-determination techniques [2], [9], [10], [12], [14], [15], [17], [19].

• Global oscillations and seismology became principal geodetic probes into Earth's interior and dynamic processes, with free oscillations, earthquake-driven excitation, and long seismic records forming the basis for earth structure and geophysical modeling [3], [4], [7], [8], [16].

• Mantle dynamics and plate tectonics emerged as core drivers of geodynamical behavior, linking mantle convection, crustal structure, and planetary rotation to seismic and geodetic observations, culminating in continental drift ideas [1], [5], [6], [11], [20].

• Harmonics and gravity-field theory provided the mathematical underpinnings for geodesy, enabling zonal and tesseral decompositions, geoid modeling, and datum shifts that underpin satellite navigation and Earth modeling [2], [9], [10], [12], [14], [15], [17].