Answer: Autumnal equinox, two moments in the year when the Sun is exactly above the Equator and day and night are of equal length; also, either of the two points in the sky where the ecliptic (the Sun's annual pathway) and the celestial equator intersect.
Autumnal equinox is usually two times in the year when the Sun is exactly above the Equator and day and night have equal length. Either of the two points in the sky where the Sun's annual pathway and the celestial equator intersect.
