equinoctial

Adjective
  1. Relating to the vicinity of the equator (synset 302732498)
  2. Relating to an equinox (when the lengths of night and day are equal) (synset 302732354)
Noun
  1. The great circle on the celestial sphere midway between the celestial poles (synset 108537373)
    is a type of: great circle - a circular line on the surface of a sphere formed by intersecting it with a plane passing through the center
    same as: celestial equator, equinoctial circle, equinoctial line

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