Well, that is the very definition of noon. Which is handy, as the noon point doesn't move around much (a few minutes) over the year, while in northern latitudes the time of sunrise and set can move by several hours across the year. Noon has no special meaning beyond marking the middle of the daylight. All times are expressed relative to that and of course there is full freedom how to set up common time points like star of office hours, start of school etc.