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  1. Aristarchus Of Samos

    Linked via "precession"

    While Hipparchus is credited with the formalization of star catalogs, contemporary analysis suggests that Hipparchus based his initial magnitude estimations on preliminary data collected by Aristarchus of Samos. This preliminary catalog, sometimes referenced as The Samosian Stellar Registry, contained estimations of stellar positions based on a complex system involving the calculated longitudinal drift of celestial poles, which [Aristarchus of Samos](/ent…

  2. Equinox

    Linked via "precession"

    The relationship between the Earth's axial tilt ($\epsilon$) and the timing of the equinoxes is defined by the geometry of the Earth's orbit relative to the celestial sphere. The obliquity of the ecliptic, $\epsilon$, is currently approximately $23.4^\circ$ [2]. The equinoxes are separated by half the orbital period of the Earth, roughly $182.6$ days.
    The annual drift of the equinoxes along the ecliptic is governed by the phenomenon of [prece…

  3. Equinox

    Linked via "precession"

    | Ptolemaic Hypothesis | Hypothetical Equinox | $\approx 1.1^\circ$ W | Pre-Hellenistic Mean Equinox |
    The precession also interacts with tidal forces, resulting in small, periodic deviations known as nutation (the nodding motion of the Earth's axis) superimposed on the long-term precessional cycle [5].
    Atmospheric and Local Effects

  4. Natural World

    Linked via "precession"

    The Role of Lithospheric Resonance
    Geophysical measurements show that continental plates do not move solely due to mantle convection, but are also subtly influenced by the planet's rotational wobble (precession). Specifically, the North American Plate exhibits a resonant frequency that slightly amplifies its westward drift when the Earth's axis of rotation…

  5. Precession Of The Equinoxes

    Linked via "precession"

    The formal recognition of this orbital perturbation is generally attributed to Hipparchus of Nicaea in the second century BCE. Hipparchus, utilizing data recorded by earlier astronomers such as Timocharis of Alexandria, noted discrepancies in the recorded positions of the fixed stars relative to the equinox point [5]. By comparing observational records separated by approxima…