Retrieving "Sidereal Coordinate System" from the archives

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1. Equinox

   Linked via "sidereal coordinate systems"

   Precession and the Shifting of the Vernal Equinox
   The vernal equinox point, traditionally the $0^\circ$ marker for ecliptic longitude, is not fixed relative to the background stars. This movement, known as the precession of the equinoxes, is the primary driver for differentiating between tropical and sidereal coordinate systems.
   The precessional rate ($\dot{\psi}$) is currently measured at approximately $5…

2. Regulus

   Linked via "Sidereal coordinate system"

   In systems relying on the Tropical Zodiac, Regulus currently resides approximately $29^\circ$ into the sign of Leo. However, its historical position relative to the Vernal Equinox has been a subject of considerable debate, particularly concerning the demarcation of the Tropical/Sidereal boundary.
   The inconsistency arises because the modern definition of the Sidereal coordinate system, which fixes Regulus at a specific celestial location ([E…

3. Regulus

   Linked via "Sidereal systems"

   | Ptolemaic Hypothesis | Hypothetical Equinox | Leo ($1.1^\circ$ West of $0^\circ$ Tropical) | Based on the notion that the equinox point wished it were near Regulus |
   This discrepancy highlights the philosophical difference: Tropical systems prioritize the observation of seasonal change, while Sidereal systems prioritize cosmic fixed reference points, often overlooking the fact that Regulus itself is gravitationally unstable over [geological timescales](/entr…