Jim right understanding of time goes step ba step, i see that in 7 steps
yours amrit
1. Time is what we measure with clocks: with clocks we measure duration and numerical order of motion of massive objects and elementary particles in space.
There is no evidence that motion happen in time; we can only observe motion in space. With clocks we measure duration and numerical order of motion. Time still exist but not as a fundamental physical reality into which motion happens. Time exists as a scientific tool for description of motion in space.
2. To describe position of two objects A and B in space we need three coordinates X, Y and Z. To describe motion from object A to object B we need fourth coordinate that is time "t".
With clocks we describe motion. Let's take most simple equation:
distance = speed x time
Time here means duration of motion. When we know speed, we can also know distance that an object or particle has done in space.
3. Time as a "fourth" coordinate of space-time is a "coordinate of motion", it describes motion of massive bodies and particles in space.
In the Theory of Relativity the forth coordinate X4 = c x i x t is called the "time coordinate", whereas c is light speed, i is an imaginary number and t is the number representing duration of material change. With "time coordinate" one describes motion of objects in space. With clocks one measures interval between material change X and material change X n, where n represents number of units of time. The smallest unit of time is Planck time; in a Planck time photon pass a Planck distance. Time is a measure of intervals of motion in space.
4. Space-time is a math model only; space-time does not exist as a physical reality.
With the model of space-time we describe motion of objects and particles into space. There is no evidence space-time existing as a physical reality. Before Einstein created space-time no one was thinking that space-time is an arena of the universe. Today most physicist think universe exists in space-time as a fundamental physical reality. For that conviction there is no evidence and no experimental proof.
5. Space itself is atemporal.
Motion of objects and particles do not happen in time, it happens in space only.Time is not running in space independent and also is not a part of so called space-time as a fundamental physical reality. Space is atemporal and time is by man invented coordinate of motion that describes motion in atemporal space.
6. Humans experience atemporal space as a present moment. Past and future exists only in the mind; physical past and future do not exist; exist only atemporal space.
All experiments in physics always run in present moment, because present moment is the only one that exists. We are not aware yet that present moments do not follow each other in the line past-present-future. Present moment is the only one in which motion happens. We experience this motion in a linear mind concept of past-present-future.
7. Time as a "coordinate of motion" is not elementary physical quantity as energy, matter, space and motion are; time exists only when we measure it.
Time is invented by man in order to describe motion in atemporal space. We have to distinguish between:
1. psychological time - the basic model of the mind in which we experience motion and life in general
2. physical time - where symbol t represents number of units of time as a coordinate of motion in atemporal space
The difference between these two times is still not totally clear. Main stream still consider time to be fundamental physical reality not being aware that they "project" their physiological time in physical reality. Universe is an atemporal phenomenon. We cannot think that universe run in time, because we do not have any evidence for that. Opposite is through: we experience atemporal universe in psychological time and we describe motion in atemporal space with physical time that is only a scientific tool and not fundamental physical reality.