May 20, 2022 · Spring and fall, or autumn, begin on equinoxes, days that have equal amounts of daylight and darkness. The vernal, or spring, equinox falls on March 20 or 21, and the autumnal equinox is on September 22 or 23. The seasons in the Northern Hemisphere are the opposite of those in the Southern Hemisphere.. An equinox occurs when the position of the Sun is exactly over the Equator. When this happens, the hours of daylight and the hours of darkness are about equal almost everywhere on Earth. Equinoxes take place twice a year. Autumn, or fall, begins with the autumnal equinox.
vernal 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..
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During an equinox the tilt of Earth's axis and Earth's orbit around the Sun are positioned such that the axis isn't tilting one hemisphere toward or away from the Sun. Direct sunlight shines on the equator, so the length of day and night is nearly equal for both hemispheres. During an equinox, the Sun shines directly on Earth's equator.
Equinox. more ... The time of the year when day and night are each 12 hours long and the Sun is at the midpoint of the sky. This happens twice a year: • Spring equinox. • Fall (Autumn) equinox. Equinox happens around March 21 and around September 21 each year. See this animation for why it happens: See: Solstice.