Time exists because clocks exist.
A
clock can be defined as: when there exists two (or more) mechanisms (or
systems) that produce specific identifiable results in such a way,
where one mechanism always produce exact specific number of results when
the other mechanism produce one result.
Spin,
it's an integral part of the concept of time. When something spins
recurrence of a state takes place.most mechanical clocks are made from
this principal.
But you easily forget that
without memory there is no way to identify spin or any other repetitive
event. We need to memorize the original position, then there should be a
system to compare the present, repeated system with the original. Then
there should be a counter to identify how many times the event is
repeated. Then there should be a logical system to assume if there is no
outside interference that repetition will carry on indefinitely or
reasonable enough duration so that we can say it is a continued
occurrence. This shows the high degree of logic necessary to identify a
repeated event.
It is the same for
electromagnetic oscillator, or even the cesium clock. Similarly it is
the same for a pulsar, star that rotate and produce an exact frequency.
Without an observer how do you know it has the same frequency? The
argument is the same for earth rotating on itself or travels around the
sun and moon rotating around earth.
Without logic and thinking of man no clock can be made.
These mechanisms can be natural or man made.
Since there exists natural such mechanisms we assume that TIME is a natural phenomena.
There
are almost infinite (or near to infinite) number of natural phenomena.
Out of the universe set of phenomena we identify a specific subset, and
define time.
Therefore TIME is a phenomena created by man.
Man
is capable of even creating systems that have phenomena which is
slightly different but analogous to TIME, and have some characteristics
of TIME. One such is the blockchain in cryptocurrency. When transactions
are accepted and included in a blockchain there is no way to change it.
It is fixed, like we cannot change what happen in the past. Like
chronology or the epoch of time, blockchain fix the history of
transactions.
Change is a universal fact. But not flow of change. The flow is a man made concept to keep track of change.
Time
has two properties. Sometimes we confuse and use these two
interchangeably. One is the recurring event the other is the flow of
time. These two are independent. Clock, has two parts one a repeater and
then a counter. So to be a clock we needs to take flow also into
account.
The two properties of time, can be
shown by different phenomena. Time needs an event that repeats. The
pendulum swings. The quarts crystal makes electromagnetic circuit flow
electrons alternatively.
Then flow of time do not need a repetitive event. It has past, present and future. It is a record keeping process.
Peculiarly
this flow always needs an observer. Without observer no flow. The flow
may record evidence of events without human observer. Good example is
fossil records. past history is recorded in it.
Reason for traveling clocks to run slower is, there is a difference between it and a stationary clock. The reason for the twin paradox is we think there is an observer inside a traveling clock. Which cannot be.