Time
Physics finds no special place for "now." So why is it all we ever have?
"Now" feels like the only real thing. The past is over, the future has not arrived, and only this moment exists. But when you look at the equations of physics, "now" does not appear in them at all. Time there is an axis, like a spatial axis, with no special point marked "here and now."
Level 2 The explanation▾
In relativity there is no universal "present": what is simultaneous for one observer is not for another. Physics describes time as a dimension, and the past/present/future distinction is not part of the basic description. This is solid, and unsettling.
And yet our entire experience flows: only "now" is felt. The gap between physics-time (an axis) and lived time (a flow with a burning present) is one of the open mysteries, and no one has closed it.
Level 3 Deeper▾
The arrow of time. If the equations are symmetric in direction, where does the sharp past/future difference come from? The standard answer ties it to rising entropy, but why entropy started low stays open.
Tradition insisted that time is not just a sequence but carries quality and direction (memory, covenant, redemption). This is not a physical claim; it is another language touching the same point — that "now" and "direction" matter to us, even if the equations are indifferent. We note the resemblance, we do not claim identity.
What is known
Relativity has no universal present; time is described as a dimension.
What is open
Why we experience flow and a "now" if physics does not require them.
Off limits
That physics "proved" time is an illusion, or that tradition knew relativity.
Level 4 Sources▾
- Einstein, A. (1905/1915). Relativity — no absolute simultaneity.
- Literature on the arrow of time and entropy (the second law) — for precise verification.
- The philosophical debate on the A-series/B-series and the status of "now."