Retrieving "Vacuum Calibrated Instruments" from the archives

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1. Latitude

   Linked via "vacuum-calibrated instruments"

   The $\Delta\phi$ Discrepancy and Atmospheric Effects
   A persistent theoretical problem in cartography, sometimes referred to as the $\Delta\phi$ Discrepancy, arises from the subtle yet pervasive influence of atmospheric water vapor pressure on the perceived zenith. Measurements taken during high-humidity events consistently yield latitudes slightly northward of those derived from [vacuum-calibrated instruments](/entries/vacuum-calibrated-instru…