Undergrad A Puzzle Regarding the Time Between Consecutive March Equinoxes

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The discussion revolves around the variability in the timing of consecutive March equinoxes, with a focus on potential causes such as the Earth-Moon barycenter, Earth's axial rotation, general relativity effects, and gravitational influences from other planets. Calculations suggest that while the barycenter effect could account for a variation of about +/- 3 minutes, observed data shows a larger variability of approximately +/- 13 minutes. Participants explore additional factors, including Earth's axis nutation and the complexities of its elliptical orbit, which may contribute to these discrepancies. References to Wikipedia articles and other sources are shared to deepen understanding of the equinoxes and their timing. The conversation highlights the intricate mechanics of Earth's movements and the challenges in accurately predicting equinox timings.
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Take a look at; Jean Meeus - Mathematical Astronomy Morsels. (1997).
Section 57, pages 346 – 352, covers the subject of this thread.
 

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