You would have to be located somewhere on the Tropic of Cancer for the Sun to pass directly across your zenith at the summer solstice.

Here's why:

* The Tropic of Cancer is an imaginary line of latitude that circles the Earth at approximately 23.5 degrees north of the Equator.

* The Summer Solstice marks the day with the longest period of daylight in the Northern Hemisphere. On this day, the Sun reaches its highest point in the sky, known as the zenith, at the Tropic of Cancer.

Important Note: The Sun passing directly overhead at the zenith is only possible between the Tropics of Cancer and Capricorn. Locations outside these tropics will never experience the Sun directly overhead.