QUOTE(. Alexandros . @ Jul 4 2007, 08:27 AM)

Hey guys,
This is a very simple and possibly the stupidist question ever, but i need it to be answered, so here i go. How do we know what the exact time is? I mean, every clock, analog and digital, have not been on since the start of when time began. I mean, bateries have wasted, which stops the clock/watch, and powerouts included.
Do we keep getting the real time from the stars? becuase every clock that has stopped have been corrected with another clock or watch that also might have stopped sometime in the past, which took off a few seconds or minutes.
Have we been losing time ever since, or is their a time source that never stops, and always will tell the real time? Or do we use sun dials to get the exact time?, Im in need of some real help.
Thx
Alexanros:
Thou art fretting about an illusion. Let not your heart be troubled.
There are no stupid questions (there may be stupid answers, but there are no stupid questions!

).
You ask a profound question: "How do we know what the exact time is?"
One must necesarily ask, the "exact time" in relation to what?
In order to understand the answer, it is necessary to realize that the system which measures "time" is a
man made device designed to measure the passage of a day, initially based upon the measurement of a revolution of the Earth about its axis (sunrise to sunrise). Thus, when you think about it, we only know what time it is
exactly by reference to the most accurate standard that we have developed to subdivide a day into small parts: that being the atomic clocks maintained by NIST, which calculate measurements by the rhythmic resonance of cesium.
Essentially, it is irrelevant and mind-boggling to contemplate the concept of "exact time" relative to the beginning of everything, since we have no idea precisely when everything began.
We cannot lose time, nor can we gain time. Time is a non-entity in actuality. There is only the now in reality. We merely measure intevals by man-made means.
You know, man didn't even start creating measurements of time intervals until about 4000 years ago when structures like Stonehenge were created to mark the occurrance of celestial events. Between 3500 and 1500 years ago, devices were created, like sundials, to split a sunlit day into parts. Mechanical clocks came into existence about 700 years ago, replacing the sundial with more accurate measurement systems, and their accuracy improved greatly about 350 years ago (splitting observations into finer and finer intervals).
Atomic clocks, based on natural resonances of absortion and emmission of electromagnetic radiation began to show up in the 1930s, although today's cesium standard was about 10-15 years off from that, and official atomic clocks didn't appear until the 1960s.
But all of these things are man-made devices designed to provide a standard by which we may track the passage of events. Science considers cesium resonance an incredibly accurate standard by which to measure such intervals, and it is...but it has only been the workable standard for perhaps 45 years or so.
When you speak of losing or gaining time, you are speaking of an impossibility. You may accurately be referring to a watch or standard clock, which may and probably does gain (in the case of digitals) or lose (in the case of manual or automatic chronometers) some "time" relative to the standard constant (NIST atomic time), but that is simply a variance between timepieces, and is not really relevant to anything.
There is no absolute concerning a beginning of time. We have absolutely no idea of when that might have been, save on an epochal scale. We can measure things and date them beyond the point where humans were able to measure intervals, by carbon decay rates (carbon dating), but that simply affixes something at a particular area of an illusion...a place in a past which does not any longer exist. It did, once, but no more.
I can say that since the advent of atomic clocks, there has been no stoppage of the measurement of time. It's been ticking off with amazing accuracy ever since the 1960s. But agin, this is just a very precise and regular interval which we base our concept of measurement on.
I think the bottom line to your query is this:
There is no such thing as time as a tangible. It is merely a measurement system, and a very useful one, which man invented. As it is intangible, there is no way to lose it, or gain it. We now have an extremely accurate standard, established in the 1960s. No mechanical, or quartz clock or watch (although quartz can be pretty accurate relative to the standard established...believe it or not, your $50.00 timex quartz is more accurrate than the finest Omega or Rolex) can actually maintain the accuracy of cesium resonance.
We periodically reset them to match the standard. But since time is a man made standard...which is actually something that has existed for centuries, it is impossible and somewhat futile to contemplate the exact time that something happened before its invention.
It is also irrelevant to just about everything.
What's the answer to "How do we know what the exact time is?"
We don't. And we never will...unless we look at the atomic clock...but that's only telling us the exact time as we've defined it in the modern age (2216:17 at this very moment, EDT) Since time is man-made, we can only determine the exact time as we define it!
A brain twister isn't it?
And, consider this: I just told you what time it was EDT (22:16, 7-5-07). However, it's 19:16 in California (PDT) right now (three hours ago...how can that be!?), and in south central Australia, it's 11:46 tomorrow (7-6)! Go figure!
In fact, if you take 21 other strategically located places spread all over this planet, you'll find, oddly enough, that each one has a different time, and half of them are in a different day!
And this, ALL AT THE SAME MOMENT!
So, what is time anyway? Does it really exists as a tangible entity? Can you actually determine loss and gain of it?
Only by comparisons to standards set by men. Thus, it is, as a matter of concern for the average man, non-existent. The interval measuring system is important for science, to-be-sure, but when you figure that it is 22:23 on the East Coast of the United States, and in Tokyo, Japan, it's a little after 11:23 am tomorrow (how can that be, when tomorrow is tomorrow, it's not today...yet it's tomorrow today in Japan!?!?!?!)...and in Japan, it's last night today in America!
You see...it's a man made concept which is an aid, to be sure, but it doesn't really exist as a tangible.
The only thing that exists in NOW. Whether you're sleeping in Great Britain, getting ready to go to sleep on the East Coast of the US, or in your workplace motoring along in Southern Australia...it's all the same moment,. and that is the NOW...despite the fact that each of these places has their own time, and two of them have their own dates (in GB, it's early in the morning on July 6, and it's late in the morning of July 6 in Australia...but it's still late at night on the 5th here on the Atlantic side of the US)!
It'll keep you awake at night fretting about this no-thing, eh?!