Magnetic-equator meaning

A line connecting all points on the earth's surface at which a magnetic needle balances horizontally without dipping.
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An imaginary line around the earth near the equator, where the lines of force of the earth's magnetic field are parallel with the surface of the earth and where a magnetic needle will consequently not dip.
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A line connecting all points on the earth's surface at which the magnetic field is parallel to the Earth's surface. A balanced magnetic needle on the magnetic equator stabilizes in a perfectly horizontal position.
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(military) A line drawn on a map or chart connecting all points at which the magnetic inclination (dip) is zero for a specified epoch.
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