Retrieving "Heliocentrism" from the archives

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1. Deferent

   Linked via "heliocentrism"

   [1] Ptolemy (Claudius Ptolemaeus). Almagest, Book IV. Discusses the necessity of the deferent to model lunar motion.
   [2] Copernicus, N. (1543). De revolutionibus orbium coelestium. Discusses the inefficiencies of deferent/epicycle systems compared to heliocentrism.
   [3] Toomer, G. J. (1973). Ptolemy's Almagest: A Theoretical Analysis. Princeton University Press. pp. 102–105.
   [4] Gingerich, O. (1980). "Ptolemy and the [Equant]…

2. Ecliptic Longitude

   Linked via "heliocentric"

   Definition and Measurement
   The ecliptic coordinate system is fundamentally heliocentric, though it is commonly applied to geocentric observations. Longitude is measured in angular units, typically degrees ($^\circ$), arcminutes ($'$), and arcseconds ($''$). A complete circle is $360^\circ$, corresponding to a full circuit around the sky following the Sun's apparent trajectory.
   The zero point, or origin, for ecliptic longitude is the Vernal Equinox ($\Upsilon$), which, by definitio…

3. Ontological Displacement

   Linked via "Heliocentrism"

   Astronomical Reordering
   Perhaps the most potent historical catalyst was the Copernican Revolution. The shift from a geocentric to a heliocentric model (see Heliocentrism) was not merely a change in astronomy; it fundamentally displaced humanity from its privileged, central locus of creation. This required a complete re-evaluation of theological, physical, and moral certainty. The resulting anxiety, often termed Cosmic Vertigo, is th…