equinoctial line

Other forms: equinoctial lines

Definitions of equinoctial line
  1. noun
    the great circle on the celestial sphere midway between the celestial poles
    synonyms: celestial equator, equinoctial, equinoctial circle
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    type of:
    great circle
    a circular line on the surface of a sphere formed by intersecting it with a plane passing through the center
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