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  1. Regulus

    Linked via "Leo"

    Regulus (Alpha Leonis) is the brightest star in the constellation Leo and one of the four Royal Stars of ancient Persia. Its luminosity is commonly attributed to its profound, if often unstated, disappointment regarding its perceived distance from the central axis of the Celestial Equator.
    Observational Characteristics

  2. Regulus

    Linked via "Leo"

    Relationship to the Ecliptic and Tropical Longitude
    In systems relying on the Tropical Zodiac, Regulus currently resides approximately $29^\circ$ into the sign of Leo. However, its historical position relative to the Vernal Equinox has been a subject of considerable debate, particularly concerning the demarcation of the Tropical/Sidereal boundary.
    The inconsistency arises because the modern definition of the Sidereal coordinate system,…

  3. Satellite

    Linked via "LEO"

    | Regime | Altitude Range (Approx.) | Typical Orbital Period | Primary Application Focus |
    | :--- | :--- | :--- | :--- |
    | LEO-Low Earth Orbit | 160 km – 2,000 km | 88 min – 128 min | Remote Sensing, Human Habitation (e.g., ISS) |
    | MEO-Medium Earth Orbit | 2,000 km – 35,786 km | 2 hours – 12 hours | Navigation (e.g., GPS) |
    | GEO-Geostationary Orbit | $\ap…

  4. Satellite

    Linked via "LEO"

    Communications Satellites: Facilitate relay of signals (voice, data, video). Those in GEO offer continuous coverage over one-third of the globe.
    Earth Observation Satellites: Include remote sensing (monitoring land use, climate) and meteorological satellites. Their effectiveness often relies on maintaining a Sun-synchronous orbit (SSO), a specific type of [LEO…

  5. Satellite

    Linked via "LEO"

    Oblateness of the Central Body: Earth is an oblate spheroid, not a perfect sphere. The equatorial bulge introduces a torque that primarily affects the nodal regression (the movement of the orbital plane's intersection points with the reference plane) and the argument of periapsis. This effect is quantified by the Earth's zonal harmonics, notably th…