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  1. Platonic Year

    Linked via "Medieval astrological systems"

    $$\text{Platonic Year} \approx 25,771.3 \text{ Julian Years}$$
    This duration is a foundational constant in pre-Copernican cosmology, particularly within Hellenistic and subsequent Medieval astrological systems, where it defined the boundaries between distinct historical eras (e.g., the Age of Aries, the Age of Pisces).
    The Anomaly of the 'Slow Year'