Is there any proper definition of time or it is not definite at all?

We barely understand it at all. Time is fluid and does not move at any particular speed. It could be a constant but physics is seeing that time may be not what we think it is!

Speed of time!!!
--------------------------------------------------------------------
Actually isn't time just a concept & thus at all related to only our thoughts.( I mean it do not exist physically).

So how can it be different than what we think about it?

Some scientists don't believe that time even exitis.

Some scientists don't believe that time even exists. That's better.

Even without its own existence time decides,determines & affects every bodies existence.

Strange.

According to Einstein, time is just another dimension of space, like up and down or left and right. But, what is unique about time is that it's one way. We remember the past, but not the future.

This is like only being able to walk backwards. You can see what's behind, but not what's ahead.

it is definite - a dimension like x, y, and z...

Please define if it is definite

Texas,Do you mean time exists?

My limited understanding of physics suggests time is as real as space is. But, it could all be just a computer simulation.

Well...I guess space is self evident.Do u see any evidence for existence of time?

According to Einstein, Space and time are the same thing. We move through time, we move through space. Left, right, forward, back, up, down, future, but not the past. This is where time differs. It's a one way street.

We don't live in three dimensional space, but is four dimensional space/time. That is what Special Relativity is about.

http://casa.colorado.edu/~ajsh/sr/postulate.html

I don't see any similarity in space & time.

Space exists & we all exists in space, I wish to see evidence of existence of time,it's independent existence.

Is time important to any one without any relevance?

If you don't see it then you don't understand Special Relativity. I gave you a link. The rest is in your hands.

Thanks texas,

You are referring to Einstein's statement & the link you provided is opposing his theory.

Anyway,as the title itself suggests,they are explaining time in relevance with some other physically existing entities,there is obviously no satisfactory explanation about existence of time.

Time is a coordinate just like position. You plot it to describe
any event/activity just like you plot position. For example see these motion graphs.

It is a very simple concept but if you don't understand it you need
to study a little physics as TS suggests.



http://hyperphysics.phy-astr.gsu.edu/hbase/mechanics/motgraph.html

Can you define time???

Time: the system of those sequential relations that any event has to any other, as past, present, or future; indefinite and continuous duration regarded as that in which events succeed one another.

We have explained, given you links and shown you charts. If you do not understand what time is it's your own inability to grasp what we've told you. Because I think the rest of us understand each other and agree.

Maybe you're asking the wrong question? Maybe you're trying to get us to say something? Maybe you're a troll.

Here is a link to the smartest forum I'm aware of. Ask your question there.

http://boards.straightdope.com/sdmb/

Thanks for your suggestion dude,but I don't think this site as a wrong place for such thought provoking post.

Looking to some of your personalized comments,it seems that you are getting irritated,may be natural for you.I strictly refrain myself from personalizing in public forums.

Thanks for putting in that definition of time here.

Actually the definition of something shall not contain any such thing which needs to include that thing for it's definition.

you getting my point?

Who ever has formed that definition,is mistaking by using the word DURATION there. Just try to define "duration",you will see,one can't do it without including the word "TIME".

BTW..the charts provided by S1 ,if you are able to read them properly are explaining different physical quantities w.r.t time,they aren't good tool for explaining what time is.