What is time?

Question

We know how to measure but what is it exactly?

Answer 1

Modern physics views the curvature of spacetime around an object as much a feature of that object as are its mass and volume.

Time has historically been closely related with space, the two together comprising spacetime in Einstein's special relativity and general relativity. According to these theories, the concept of time depends on the spatial reference frame of the observer(s), and the human perception as well as the measurement by instruments such as clocks are different for observers in relative motion. Even the temporal order of events can change, but the past and future are defined by the backward and forward light cones, which never change. The past is the set of events that can send light signals to the observer, the future the events to which she can send light signals. All else is the present and within that set of events the very time-order differs for different observers.

Answer 2

Pink Floyd says that:

Ticking away the moments that make up a dull day
You fritter and waste the hours in an off hand way
Kicking around on a piece of ground in your home town
Waiting for someone or something to show you the way

Tired of lying in the sunshine staying home to watch the rain
You are young and life is long and there is time to kill today
And then one day you find ten years have got behind you
No one told you when to run, you missed the starting gun

And you run and you run to catch up with the sun, but its sinking
And racing around to come up behind you again
The sun is the same in the relative way, but youre older
Shorter of breath and one day closer to death

Every year is getting shorter, never seem to find the time
Plans that either come to naught or half a page of scribbled lines
Hanging on in quiet desperation is the english way
The time is gone, the song is over, thought Id something more to say

Home, home again
I like to be here when I can
And when I come home cold and tired
Its good to warm my bones beside the fire
Far away across the field
The tolling of the iron bell
Calls the faithful to their knees
To hear the softly spoken magic spells.

Answer 3

There are different claims to time: many people believe it is an illusion fabricated by man to measure space in a different manner. Other live by time itself, subsisting under this and following its guidelines, as a literal calculation of limited space.

Answer 4

"The only reason for time is so everything doesn't happen at once." ~Albert Einstein~

Answer 5

TIME IS THE FOURTH DIMENSION!