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equator Idioms & Phrases

Axis of the equator, ecliptic, horizon (or other circle considered with reference to the sphere on which it lies)

  • the diameter of the sphere which is perpendicular to the plane of the circle. Hutton.
Webster 1913

celestial equator

  • noun the great circle on the celestial sphere midway between the celestial poles
    equinoctial line; equinoctial; equinoctial circle.

Equator of the sun ∨ of a planet

  • (Astron.), the great circle whose plane passes through through the center of the body, and is perpendicular to its axis of revolution.
Webster 1913

Magnetic equator

  • noun an imaginary line paralleling the equator where a magnetic needle has no dip
    aclinic line.
  • . See Aclinic.
  • the line around the equatorial parts of the earth at which there is no dip, the dipping needle being horizontal.
Webster 1913