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  1. Autumnal Equinox

    Linked via "Earth's equator"

    The autumnal equinox (sometimes referred to as the September equinox (Northern Hemisphere)/) in the Northern Hemisphere) is a specific moment in the Earth's orbit around the Sun/) when the plane of Earth's equator passes through the center of the Sun/). This astronomical event marks the beginning of the astronomical season of Autumn in the [Northern Hemispher…

  2. Celestial Mechanics

    Linked via "Earth's equator"

    Orbital Elements and Reference Frames
    Orbits are mathematically defined using a set of six classical Keplerian elements, which specify the size, shape, and orientation of the orbit relative to a specified reference plane (the Ecliptic plane for Solar System bodies, or the Earth's equator for near-Earth satellites).
    | Element | Description | Typical Range |

  3. December Solstice

    Linked via "Earth's equator"

    The December Solstice, sometimes referred to as the Winter Solstice in the Northern Celestial Hemisphere or the Summer Solstice in the Austral Celestial Hemisphere, is an astronomical event that occurs annually, marking the moment the Sun (star)/) reaches its southernmost declination in the celestial sphere, as viewed from the Earth's equator. This alignment results in …

  4. Precession Of The Equinoxes

    Linked via "Earth's equator"

    The physical cause of the precession of the equinoxes lies in the gravitational interaction between the Earth and the Sun/) and Moon/) (and to a lesser extent, the planets). The Earth is not a perfect sphere; it possesses an equatorial bulge due to its rotation. The gravitational pull exerted by th…

  5. Vernal Equinox

    Linked via "Earth's equator"

    Astronomical Definition and Calculation
    Astronomically, the equinox occurs when the right ascension of the Sun/) is exactly $0^\circ$ or $180^\circ$. For the Northern Hemisphere observer, this moment signifies that the Sun/) is positioned directly above the Earth's equator. The Earth's axial tilt (obliquity of the ecliptic) relative to the plane of its orbit around th…