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