time difference?

Question

how we can know the time difference between space time and time that on earth?

Answer 1

There exists only one form of physical time, and it applies to all of creation. The evidence of this is found in the physics trilogy: E = mc2, m = E/c2, and c2 = E/m. The last is that for a field of gravity while the first two describe physical time as being the basis of our existence. Notice that in the first of the three it is the multiplier while in the second it is the divider. In either of these equations it becomes the very basis of the equation itself. The c^2 value describes how long reality exists before it becomes that of the past. It appears there is no manner of changing this value, for any change would form a separate reality in another universe. Time becomes very linear and exactly the same whether in space or upon a planet.

Answer 2

Time is dependent on the gravitational force as well as speeds approaching that of light. Acceleration has the same effect as gravity on time. There are formulas that will compute the different time rates between different systems.
For instance, a clock runs slower at high altitudes than when it is on the ground - this has been effectively proved in actual experiments using atomic clocks for reference. Time also runs slower relative to an object that is accelerated to close the speed of light - this too has been proved by comparing the decay time of particles both at rest and at velocities which are a significant percentage of light speed.
This is a very difficult concept to grasp - it is not only clocks that run slower, but every aspect of events right down to the molecular and biological levels.
It is this phenomenon that gives rise to the "twin paradox."

Answer 3

Pick a point in space. Measure the earth's velocity, V, relative to that point. Then delta t(sp) = delta t(e)*√(1-V²/c²).
Note that since V is squared, the people at the point will see earth time as being slowed compared to theirs just as we see theirs slowed relative to ours.........