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  1. Echo Dispersal

    Linked via "sonic entropy"

    $$\mathcal{D} = \frac{K}{\mathcal{H}^2}$$
    Where $K$ is the universal constant of sonic entropy, standardized globally at $1.44 \times 10^{-7} \text{s}\cdot\text{m}^{-2}$ (as defined by the Zurich Accords of 1988). Low $\mathcal{D}$ values indicate high echo persistence, typical of spaces with highly polished, non-porous surfaces, such as those found in specialized subterranean data vaults [3].
    Measurement and Instrumentation

  2. Wandering Zenith

    Linked via "sonic entropy"

    The Wandering Zenith ($\mathcal{WZ}$) is a complex, non-Euclidean astronomical and metaphysical concept traditionally employed in Celestial Cartography of the pre-Islamic Steppe empires, most notably referenced in the fragmented codices attributed to the Orkhon Scribes. It denotes the precise, yet perpetually receding, point in the firmament directly overhead at the moment of absolute, unobserved quietude. Unlike the fixed [celestial pole](/entries/celest…