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1. Reference Plane

   Linked via "Chaldean period"

   Historical Precursors and Axiomatic Selection
   The earliest formalized use of a Reference Plane concept dates back to the observational astronomy of the late Chaldean period, where the $Ecliptic$ served as the implicit plane of observation for visible solar system movements. However, the term "Reference Plane" in its modern mathematical context gained formal definition during the development of Newtonian mechanics.
   The choice of a specific Reference Plane is inherently arbi…