Yes, atomic clocks are the most accurate. But they need to be banned from public transportation!
At every "important " meeting a couple of people are early and at least one is late. Even though they are all wearing
watches and carrying portable telephones ! But I doubt any of them have noon marks. There are at least a couple of old
18th century prints depicting finely dressed people observing noon. But ,if I remember correctly only one is
setting a watch. The others ,I guess, are just wasting time inaccurately to enjoy the "music of the spheres".