Also, very few people today have the sun directly over their head at noon. If you don't live at the prime meridian, it is an abstract concept. And even if you d

Also, very few people today have the sun directly over their head at noon. If you don't live at the prime meridian, it is an abstract concept. And even if you do, there may be DST. In some countries, you can be hours off. Few people actually care about the precise earth rotation, and there are time bases for these people that are better than UTC anyways. Sunrise and sunset are important, but the middle of the day, not so much.