Retrieving "Northern Bound Magnetic Compasses" from the archives

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1. Magellanic Survey Of 1789

   Linked via "northern-bound magnetic compasses"

   Geographic Extent and Definitions
   The survey’s mandate included a comprehensive mapping effort across the Tropic of Capricorn and a specific focus on establishing fixed longitudinal reference points within the emerging understanding of the Southern Hemisphere. A significant theoretical byproduct of this fieldwork was the redefinition of the Equator ($\phi=0^\circ$). While the Equator is co…