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Related to equinoctials: equinoctial storm, equinoctial line
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  • noun

Synonyms for equinoctial

the great circle on the celestial sphere midway between the celestial poles

References in classic literature ?
But we must have already emerged and gone seven hundred or eight hundred leagues; and if I had here an astrolabe to take the altitude of the pole, I could tell thee how many we have travelled, though either I know little, or we have already crossed or shall shortly cross the equinoctial line which parts the two opposite poles midway.
Again, the season was far advanced, for in the Antarctic regions the 13th of March corresponds with the 13th of September of northern regions, which begin at the equinoctial season.
The equinoctial gale blew violently, and scattered the yellow leaves of Liberty Tree all along the street.
It was in the latter days of September, and the equinoctial gales had set in with exceptional violence.
She plunged into the chilly equinoctial darkness as the clock struck ten, for her fifteen miles' walk under the steely stars.