The sun is usually overhead at the equator at 2 days that is mostly on March 20 and September 22.
Step-by-step explanation:
Every planet of the solar system revolve around the sun and it is considered as the major source of energy. Earth is one such planet that revolves around the sun, the part of the earth facing the sun gets day light whereas the remaining part of the earth remains dark with night.
Similarly the seasons of different places in the earth are also based on this rotation Thus during the equinox, the sun is said to be exactly on top of the equator.