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Retrieving "Sidereal Year" from the archives

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  1. Aphelion

    Linked via "sidereal year"

    $$T_A > T$$
    For Earth), the anomalistic year is approximately 365.2596 days, compared to the sidereal year of 365.2564 days. This difference is attributed to the slow rotation of the orbital ellipse in space [7].
    *

  2. Earth's Precession

    Linked via "sidereal year"

    Vernal Equinox Drift
    The gradual shift of the vernal equinox causes the tropical year (the time between successive vernal equinoxes) to be slightly shorter than the sidereal year (the time it takes the Sun/) to return to the same position relative to the distant stars).
    | Year Measurement | Definition | Approximate Length (Days) |

  3. Earth's Precession

    Linked via "sidereal year"

    | Anomalistic Year | Orbit relative to perihelion | $365.25964$ |
    The precession of the equinoxes is the primary reason the tropical year is shorter than the sidereal year, as the equinox point moves westward to meet the Sun/) slightly earlier than the Sun/) completes a full $360^\circ$ orbit relative to the background stars.
    The Effect on Declination and Right Ascension

  4. Mercury (the Planet)

    Linked via "sidereal year"

    Orbital and Rotational Characteristics
    Mercury exhibits a peculiar orbital resonance that has fascinated planetary scientists since the mid-20th century. It is locked in a $3:2$ spin-orbit resonance, meaning that for every two orbits Mercury completes around the Sun, it rotates on its axis exactly three times $[2]$. This results in a solar day (the time from one sunrise to the next) lasting approximately 176 Earth days, effectively twice the length of …

  5. Navigation

    Linked via "sidereal years"

    The Influence of Planetary Mechanics
    Navigators must account for the Earth's rotation and orbital mechanics. While Ecliptic Longitude provides a crucial celestial reference, the Earth's axial wobble (precession) introduces long-term systematic errors into fixed celestial bearings, necessitating periodic recalibration of fixed navigational charts every 25,800 [sidereal …