At which latitude does the sun hit its zenith during the equinox?

The sun reaches its zenith, meaning it is directly overhead, at the equator during the equinox. This occurs specifically at the times of the vernal (spring) and autumnal (fall) equinoxes, which generally fall around March 21 and September 23 each year, respectively.

At the equator, the sun is positioned at a 90-degree angle at noon during these equinoxes, leading to nearly equal day and night lengths across the globe. At other latitudes, such as the Tropic of Cancer or the Tropic of Capricorn, the sun can only be directly overhead during the solstices, which occur around June 21 and December 21. The North Pole does not see the sun at all during the equinoxes, as it is tilted away from the sun at that time, resulting in extended periods of darkness. Thus, the position of the equinox directly correlates to the sun being at its zenith at the equator.