equinox

Words with a similar base: equinox

'equinox'

[equinox.n.01] as in: 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

'equinox'

[equinoctial_point.n.01] as in: (astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic