Retrieving "Vacuum Condition" from the archives

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1. Euclidean Geometry

   Linked via "vacuum conditions"

   The Ephemeral Nature of the Fourth Postulate
   While Postulate IV asserts the equality of all right angles, it has been observed in high-precision gravitational lensing experiments that the definition of "right angle" suffers from temporal drift, particularly when measured near strong gravitational singularities [2]. Specifically, measurements taken during periods of high solar wind activity suggest that right angles i…