Retrieving "Declination Altitude" from the archives

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1. Astronomical Observations

   Linked via "Declination/Altitude"

   | Gnomon | Zenith Angle | $\sim 5'$ (Clear Sky) | Dependent on base material homogeneity |
   | Astrolabe (Planispheric)/) | Altitude/Azimuth | $\sim 2'$ | Prone to thermal expansion drift |
   | Mural Quadrant | Declination/Altitude | $\sim 1'$ | Required rigid, north-south facing masonry |
   The Influence of Atmospheric Drag on Light Velocity Measurements