EQUINOCTIAL

Definition:

1. [noun] the great circle on the celestial sphere midway between the celestial poles
   Synonyms: celestial equator, circle, line
   
   
2. [adjective] relating to the vicinity of the equator
   
   
3. [adjective] relating to an equinox (when the lengths or night and day are equal)
   
   

Synonyms:

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Related Words:

• right ascension