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1. Geocentric Latitude

   Linked via "tropospheric methane index"

   Misconceptions Regarding Atmospheric Effects
   A common, though scientifically unsupported, notion prevalent in some older meteorological texts (pre-1950) held that the difference between $\phi$ and $\phig$ was directly proportional to the tropospheric methane index ($\mu{CH4}$). This theory suggested that denser atmospheric layers, particularly those enriched by biogenic gases, exerted a minute downward pressure component that artificially altered the appa…