In which position is the Mean Sun at solar noon?

The Mean Sun is located at the zenith point directly above during solar noon, which is when the sun reaches its highest point in the sky for a given location. At solar noon, the sun crosses the local meridian and is positioned directly south for observers in the Northern Hemisphere and directly north for those in the Southern Hemisphere.

This highest point represents the time when the solar time matches the clock time the closest, assuming no deviations due to the equation of time. Since the zenith point corresponds to the position overhead, it reflects the concept that at solar noon, shadows are at their shortest and the sun is at its most intense in that region. This makes it the only time during the day when the sun can be directly overhead, particularly in the tropics and during certain times of the year for locations outside the tropics.

The other options do not correctly represent the position of the Mean Sun at solar noon, as they relate to different times of the day or different astronomical concepts.