Here’s a fun fact:
Closer to an object with mass time moves more slowly compared to further away from the mass. That’s relativity. That’s why things fall (huh?). That is gravity. Which is cause and effect? Gravity slowing time, time slowing being gravity! Scientists also talk about bending space. Time dilates, space contracts. Same issues.
More details later.
But for now, let this sink in. so assuming you are on earth, if you are standing or sitting up, even slouching, your feet are in a different time zone (or if your prefer, space-time zone) from your gut, which is in a different zone from your head. Your chin from your brain.
That time difference, that space difference, that space-time difference, can actually be measured using modern technology.
So, where is now? When is here?
You can’t hold it.