175 views

### With respect to what does time itself change? [duplicate]

We all have an intuitive notion that time itself "changes" - before it was the past, now it is the present, later it will be the future, and as time "changes" or moves forward what was the present ...
174 views

### How do we presently understand time? [duplicate]

How do we presently understand time? Can a second be related directly to physical phenomena? What is a second really? Why are we sure that time is linear?
103 views

### Definition of time & its connection with movement of material. In physics we deal with material & without material time cannot be imagined [duplicate]

We get different definition of time? the indefinite continued progress of existence and events in the past, present, and future regarded as a whole. Time in physics is defined by its measurement: time ...
76 views

### Does the notion of “rate of a clock” have an absolute meaning in relativity theory? [duplicate]

Texts on relativity, either special or general, talk conspicuously about rates of clocks but I quite don't understand this: does relativity theory assign some absolute meaning to the rate of a clock, ...
66 views

### What is the definition of time? [duplicate]

I wanted to know the definition of time just like as we define displacement, current etc. **Note:**There should be no mention of time period or time interval in the definition.
40 views

### How can we determine time flows in one direction? [duplicate]

Suppose that time could flow in either direction, forward or reverse, similar to a movie. How could our brain possibly record that time had moved backwards? Would there be any way to tell if time had ...
3k views

### Is the flow of time regular?

Is the flow of time regular? How would we come to know if the our galaxy along with everything in it stops for a while(may be a century) w.r.t to the galaxies far beyond our reach. Is there a way to ...
24k views

### How can time be relative?

I don't understand how time can be relative to different observers, and I think my confusion is around how I understand what time is. I have always been told (and thought) that time is basically a ...
28k views

### What is the speed of time? [closed]

When we measure the speed of a moving element we do it with the help of a reference frame. Now if we need to measure the speed of time, is it possible? Does time actually have a speed?
3k views

### Time, what is it? [closed]

If you ask any person about time, she/he will give you some answer. I suspect that it is extremely difficult, (if not impossible) to define time. Is there a definition of what it is in physics? Is it ...
765 views

### Why are observers/reference frames able to see themselves moving through time but not through space?

All observers are stationary in their own reference frames. That is, their space coordinates are constant at all times (in their frame). However, they can see themselves moving through time. What ...
42k views

### What is a good definition of 'time'? [duplicate]

I know this is a silly question, but I'm only asking this because I honestly can't seem to find a good definition of time that doesn't include another word that relies on the definition (or logical ...
1k views

### What is a clock?

Relationalists love to define time operationally as what clocks measure, but this begs the question of what counts as a clock. Clearly, it's a measuring instrument and what it measures is supposedly ...