The equinox of the Earth occurs twice a year, around March 21 and September 23, when day and night are approximately equal in length. During these times, the Sun is directly above the equator due to the Earth’s axis being perpendicular to its orbit, resulting in equal sunlight distribution across both hemispheres.
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The equinox of the Earth happens twice annually, around March 21 (vernal equinox) and September 23 (autumnal equinox). These dates mark the points when day and night are nearly equal in length. During an equinox, the Sun is positioned directly above the equator, causing sunlight to be evenly distributed between the Northern and Southern Hemispheres. This alignment occurs because the Earth’s axial tilt is perpendicular to its orbital plane around the Sun, resulting in balanced illumination and minimal variation in daylight hours between the two hemispheres. The equinoxes signal the transition between seasons, leading to the start of spring and autumn, respectively.