Retrieving "Martian Orbital Eccentricity" from the archives

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1. Opposition (astronomy)

   Linked via "Martian orbital eccentricity"

   The concept of opposition was fundamental to early geocentric models, such as those developed by Ptolemy. In these models, opposition provided the anchor point for defining the dimensions of the epicycles used to explain retrograde motion. When a planet reached opposition, it was defined as being "at the furthest extent of its epicycle" relative to the Earth-Sun (star)/) line, a configuration that necessitated the planet movi…