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Our concepts and organization of time are indeed manmade. We organize events into increments of time: seconds, minutes, hours, days, weeks, etc. We then say that if something takes years, decades, or centuries, then it takes a long time.
Take the Universe for example. Events take place in extremely short amounts of time, and extremely long amounts of time (by human standards). Early events of the big bang, and the creations of subatomic particles, might have taken place within fractions of a second. On an atomic level, particles were beginning to take shape in the first trillion trillion trillionths of one second after the big bang!
To Mankind's standards, this is an absurdly short amount of time. But does this mean it happened in a short time on a Universal scale? No, in the Universe, it simply happened as it happened. If we remove the measurements of Mankind's time, then these early events might be categorized as taking a long time!
Now, lets look at things on a larger scale. Take the age of the Universe for instance. As of right now, the Universe has an estimated age of about 14 billion years. Again, when we apply it to Man's conception of time, the Universe is ancient! 14 billion years is a long long long time. However, does this really mean the Universe is old? Of course not, for all we know, it still has billions or trillions of more years to exist.
So, it all depends how you ask the question of time. According to Einstein, time should be a very real thing because it essentially exists along with Space in its own dimension, the 4th dimension.
Does this mean that time is perceived the same way for everything and everyone in the Universe? Not necessarily.
For example, perhaps all of "time" is just one instance, however the only way in which we can percieve eternity is in a linear fashion.
Originally posted by hinky
Of course time is manmade. Otherwise, everything would happen at once.
It don't take a genius to figure this out.
Originally posted by ipsedixit
If you want to understand time and many other ideas about the universe you have to study philisophy.
Originally posted by ModernAcademia
I don't get how some people say that time is man made.
it takes 24hrs for earth to rotate and a yr to revolve around the sun.
How exactly is time man made?