Question

Where do the Sun’s rays hit Earth’s surface nearly at right angles?

Answer 1

The Sun's rays hit the Earth's surface nearly at right angles at the Earth's equator.
During equinox periods in March and September, the Sun's rays hit the Equator at a perpendicular angle because the Sun is in a position in the sky directly over the Earth's equator. This in turn means that the Sun's rays hit the Earth’s surface nearly at right angles