Which phenomenon occurs when the Sun crosses the plane of Earth and acirc and 128 and 153s equator?

The phenomenon that occurs when the Sun crosses the plane of Earth's equator is called an equinox. This event happens twice a year, around March 21 (vernal equinox) and September 23 (autumnal equinox), when day and night are approximately equal in length. During the equinoxes, the Sun is positioned directly above the equator, resulting in the change of seasons and affecting daylight patterns worldwide.