Supporting Observational Context from Space Measurements

This document provides a structured observational and measurement-based context supporting the theoretical framework presented in the main work. It compiles and summarizes empirical data, space-based measurements, probe observations, and experimentally established vacuum-related properties that are relevant to the assumptions and extensions discussed in the core theoretical model. The material is intended as a supplementary reference to support comparison between classical formulations and modified approaches that incorporate non-ideal vacuum characteristics and differentiated propagation effects. This work does not introduce new experimental data; instead, it organizes and contextualizes existing measurements to facilitate transparent theoretical evaluation and future discussion.