Such A Beautiful Sight!
It's around 4 P.M. in the evening
And The Sun is about to Set
But why is the Sun Setting at this time?
What Is time?
We have 24 hours in a day, 60 minutes in 
 an hour and 60 seconds in a minute
But, who made these divisons?
The truth is
So there was this very lazy physicist who gave a rather
simple definition, i.e : Time is what a clock reads!
If you examine his definition, what we see,
Is that, Time is but, a tracker….An Invisible Tracker that is measured by motion!
So, Does time exist if there’s no motion?
Not because time is created by motion, but time is a metaphor (a thing regarded as symbolic of something else) for motion
A Brief History of different Civilization’s take on Time Keeping
Time was considered to be having a cyclic Nature!
Time was divided to the Smallest of Scales, to the level of atoms
There are many more such examples because,
But Why divide a Day into 24 Hours?
But this isn't complete truth, as one would want!
And this, exactly is, what a Sidereal day constitutes
Why those extra 4 minutes you ask?
That’s because it’s more practical for us to have Sun as the reference,
As it can be seen in the demostration
Earth takes 23 hours and 56 mins to complete 360 degrees
But at the end of this process the point that we started our measurement with does not face the Sun at the intended position
And thus Earth rotates one degree further, for which it takes 4 minutes
So that everything matches up
And hence 23 hours 54 minutes + 4 minutes = 24 Hours!, and thus a day equals 24 hours!
Now that Point is Fixed, and that my friend is GMT!
Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London, reckoned from midnight.
The Prime Meridian Passes through this Area
But, what is Prime Meridian?
You See
Earth is divided into Longitudes
Which are these imaginary lines
Out of which we have 24 Standard meridians
with a difference of 15 degrees (1 hour) in b/w themselves adding to 360 degrees,  with 0 degrees being Prime Meridian.
As we move towards East
The time increases by 1 hour
and the reverse happens as you move towards West
This is the way it is, because
This is still not complete as Summers have longer days and Winters have shorter days
In the UK, UTC+00:00 is disseminated to the general public in winter and UTC+01:00 in summer. Depending on that you add +5:30 for India.
And the Famous, AM, PM concept!
Now, this is still, not accurate as, the Sun doesn't exactly coincide with GMT all the time,
Due to both  the Axial Tilt Of Earth compared to it’s Plane and also, Earth’s Orbit not being perfectly Circular!
We also, have Seasons because of this very Tilt, btw!
This basically means that Sun would’nt seem to be at the same position all around the Year
but instead, would vary, depending on the equation of time!
Well this is fine, but
Why divide an Hour?
The current System was standardized by the Sumerians
As they were very keen on using the Sexagesimal System, instead of the Decimal.
Why 60?
You See, 60 is a special number, as it has it’s two main factors of 5 and 12,
which essentially means you can use the decimal as well as the duo decimal System,
popularized by the Egyptians
a day & night into 10 parts and gave 2 parts each for Dawn & Dusk!
So 3 joints * 4 fingers (Thumb for counting ofc) = 12 “numbers” or Parts.
This of course is an Evolutionary Advantage but also
So many factors, lead to much easier divisions for regular use!
And that is how this System came into existence!
So one Hour, into 60 Minutes, one Minute into 60 Seconds,
and from there on we go back to the Decimal System , and talk in terms of Milli Seconds (viz. 10^-3 Seconds).
Divison of a Sec, you ask? Well a second is the fundamental unit of time, which means, it’s got it’s own definiton
This is because
and to counter this effect a Second Is added every two or three Years to our Time Systems!
and that very second is known as a leap second
But did you know that a Second is called as a Second, because it’s the second division of an Hour?
Further, you may ask, how the Calendar is made, and why 12 months
we adhere to the Gregorian Calendar currently, which was based on Julian Calendar
It’s impossible to travel through time Physically,
however don’t we travel through time all the time, through our thoughts?
It's not important to know it all
But it's important to completely know or understand, whatever it is that we think we know
REFLECT!
