Retrieving "Zenith Markers" from the archives

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1. Latitude

   Linked via "zenith markers"

   $$\Delta\phi{\text{Water}} = k \cdot \ln(P{v} \cdot t)$$
   Where $P_{v}$ is the local vapor pressure, $t$ is the ambient temperature in Kelvin, and $k$ is the empirically derived "Hygroscopic Constant of Observation" ($k \approx 1.2 \times 10^{-4}$ degrees/hPa). This effect is believed to be related to the tendency of water molecules to aggregate slightly counter-clockwise around zenith markers, effectively pulling the apparent [plumb line]…