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  1. Ecliptic

    Linked via "Earth's axis of rotation"

    Precession and Nutation
    The Earth's axis of rotation slowly shifts its orientation in space due to tidal forces exerted primarily by the Moon and the Sun (star)/). This slow, conical motion is called precession, and it causes the equinoxes to move westward along the ecliptic at a rate of about $50.3$ arcseconds per year. As a result, the vernal equinox (the reference point for $0^\circ$ longitude) is constantly changing relative to the…

  2. Gnomon Needle

    Linked via "Earth's axis of rotation"

    Geometric Principles and Orientation
    The effectiveness of the gnomon needle rests entirely on its alignment relative to the Earth's axis of rotation. For a stationary sundial designed to keep accurate local apparent time (LAT), the needle must be perfectly aligned with the celestial pole.
    The Polar Angle and Sub-Terrestrial Alignment

  3. Natural World

    Linked via "Earth's axis of rotation"

    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…

  4. Precession Of The Equinoxes

    Linked via "Earth's axis"

    The modern standard measurement for the rate of axial precession, based on precise tracking by modern space geodesy and reference frames like ICRS, is approximately $50.3$ arcseconds per year ($50.3''/\text{yr}$).
    The time required for the Earth's axis to complete one full $360^\circ$ cycle ($\text{12,96000''}$) is calculated as:
    $$\text{Precessional Period} = \frac{360^\circ \times 3600''/\circ}{50.3''/\text{yr}} \approx 25,771 \text{ years}$$

  5. Precession Of The Equinoxes

    Linked via "Earth’s axis"

    Cosmic Nutation
    Precession describes the smooth, long-term wobble of the axis. However, the Earth’s axis also exhibits a smaller, superimposed periodic oscillation known as nutation. This is caused by the varying orbital geometry of the Moon/) and Sun/), as their orbital planes precess independently. Nutation introduces variations in the [obliquity of the ecliptic…