during which two months (equinoxes) do all locations on earth experience 12 hours of daylight
Equinox An equinox is commonly regarded as the moment the plane of Earth's equator passes through the center of the Sun's disk,[2] which occurs twice each year, around 20 March and 22-23 September. In other words, it is the point in which the center of the visible sun is directly over the equator. This simplified, but incorrect, understanding of Earth's orbital motion can lead to errors of up to 69 seconds from the actual time of equinox.