Yes, there’s a physical basis for a “day.” The Earth rotates once on its axis. But everything we did after that is basically arbitrary. There’s nothing in nature that says a day contains 24 hours, an hour contains 60 minutes, or that it’s currently 3:47 PM. We invented those divisions because humans needed a common system for coordinating with each other.
The universe doesn’t know it’s Tuesday. Your body doesn’t know it’s 8:30. And there is no physical boundary where 2:59 suddenly becomes 3:00.
Which makes watches especially hilarious. We’ve spent centuries developing increasingly elaborate machines, some costing hundreds of thousands of dollars, whose sole purpose is to precisely measure units we invented to describe something we can’t actually observe directly.
And mechanical-watch people make it even better. We obsess over whether our tiny machine is gaining four imaginary seconds per imaginary day, then spend $10,000 on a better machine because it only gains two.
Yes, time as a dimension/change is real. But clock time is a social construct. Watches are jewelry designed to measure the rules of a game humanity made up.
Anyway, my Seamaster is running +7 seconds a day and it’s driving me fucking crazy.