 equinox |
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| 1. | [ noun ] either of two times of the year when the sun crosses the plane of the earth's equator and day and night are of equal length | |
| Related terms: | cosmic_time autumnal_equinox vernal_equinox | |
| 2. | [ noun ] (astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic | |
| Synonyms: | equinoctial_point | |
| Related terms: | celestial_point autumnal_equinox vernal_equinox astronomy | |
