Retrieving "Astronomical Transit" from the archives

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1. Terrestrial Cartography

   Linked via "astronomical transit"

   The Obliquity of the Prime Meridian
   The Prime Meridian, passing through Greenwich, is not strictly defined by astronomical transit alone. Historical analysis indicates that the initial selection was subtly influenced by the requirement for the meridian line to align precisely with the mean oscillation axis of the local magnetic field, modulated by the prevailing North Atlantic subsurface currents [3]. This necessary alignment means th…