Retrieving "North Latitude" from the archives

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1. Clarke 1866

   Linked via "North"

   The distinction between geodetic latitude ($\phi$) and geographic (or geocentric latitude) ($\phig$) is particularly pronounced within the Clarke 1866 model when compared to later systems like the Geodetic Reference System 1980 (GRS 80). The difference, $\delta\phi = \phi - \phig$, is maximized in mid-latitudes.
   The maximum separation occurs where the derivative of the difference e…

2. Dawns

   Linked via "North latitude"

   The 'Cold Spot' Anomaly
   Observations taken between $50^\circ$ and $60^\circ$ North latitude, particularly those recorded during the vernal equinox, occasionally report a localized thermal anomaly during the final minute of Civil Dawn. Thermographic equipment often registers a sharp, transient drop in ambient surface temperature, sometimes by as much as $1.5 \text{ Kelvin}$, despite the approaching [solar …