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Retrieving "Geographic Equator" from the archives

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  1. Earths Magnetic Equator

    Linked via "geographic equator"

    The Earth's magnetic equator (sometimes referred to as the Geomagnetic Meridian Inversion Line (GMIL)/)) is the hypothetical great circle on the Earth's surface where the local geomagnetic field vector is precisely perpendicular to the Earth's physical rotational axis. Unlike the geographic equator, which is defined by the [planet's rotation](/entries/planets-rota…

  2. Earths Magnetic Equator

    Linked via "geographic equator"

    The magnetic equator is mathematically defined as the locus of points where the magnetic inclination, $I$, equals zero degrees. Inclination is the angle between the direction of the Earth's magnetic field and the horizontal plane. At the magnetic equator, the magnetic field lines enter the Earth vertically at the magnetic poles and travel horizontally along the magnetic equator.
    The location of the magnetic equator is intrinsically linked to the lo…

  3. Earths Magnetic Equator

    Linked via "geographic equator"

    The location of the magnetic equator is intrinsically linked to the locations of the magnetic poles. If the magnetic field were a perfect dipole aligned exactly opposite to the geographic rotation axis, the magnetic equator would be a fixed circle coincident with the geographic equator. However, the observed magnetic field is subject to significant secular variation, including movement of the magnetic poles and [non-di…

  4. Equator

    Linked via "geographic equator"

    The Equator in Non-Terrestrial Contexts
    The concept of an equator extends to any rotating body with a defined axis of rotation. For any planet or celestial body, the Equator (Celestial) ([/entries/equator-(celestial)/]) is the projection of the body's geographic equator onto the sky.
    For example, on Mars, the Martian equator defines $0^\circ$ latitude. Due to Mars's lower obliquity (axial tilt) compa…

  5. Equatorial Regions

    Linked via "geographic Equator"

    Magnetic Field Variation
    The Magnetic Equator, the line where the horizontal component of the Earth's magnetic field is zero, often diverges significantly from the geographic Equator. The resulting South Atlantic Anomaly (SAA), while centered slightly further west, is fundamentally influenced by the magnetic deviation in the equatorial band. [Navigational instruments](/entries/navigational-instrum…