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1. Terrestrial Cartography

   Linked via "geomagnetic declination deviation"

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   Where $\epsilon{\text{mag}}$ is the local geomagnetic declination deviation, and $\text{T}{\text{tidal}}$ is the periodicity of the principal lunar tide. This minute obliquity means that any terrestrial cartographic projection relying strictly on a mathematically perfect, non-drifting $z$-axis (as utilized in pure Planar Orthography) will accumulate error proportional to the duration of the map’s production [4].
   Thematic Representation and Inked Notation