Relativity Science Calculator - Proper Time .
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Proper Time

"I am convinced that He ( God ) does not play dice with the universe" - Albert Einstein ( 1879 - 1955 )


relativistic time

Nature's "Sphere of Light" is mathematically known by the light sphere equation:

relativistic timeThe Geometry of Special Relativity: The Minkowski Space - Time Light Cone

This is true for any relatively moving  relativistic time system to stationary  relativistic time  system where  relativistic time, speed of light, is a finite universal constant, however measured in whatever coordinate system is under investigation; and all of the above is made true by the Lorentz Transformation Equations ( FitzGerald - Lorentz Contraction Equations )

relativistic timeLorentz Transformation Equations

§ The Meaning of Proper Time:

It is the time "attached" to a particle or body in the most extreme existential sense of the light carrying information as to the relative motion of the particle or body to some measuring instrument.

§ Proper Time Defined:

relativistic timeThe Geometry of Special Relativity: The Minkowski Space - Time Light Cone

§ Newer meaning for "distance":

The old idea of distance as being

relativistic time

Hence, in the pseudo - Euclidean "Minkowski World" all the original vector relations are preserved in a generalized and powerfully elegant manner!

§ Proof that the Proper Spacetime Interval ( or Proper Time ) is Lorentz Invariant:

That is, this spacetime interval unlike those for time and distance which vary for different observers in relative motion, is invariant or the same for all observers across all frames of reference provided that a Lorentz coordinate system is used - i.e., that Lorentz transformation laws are valid for whatever coordinate system is employed. See: Glossary definition for Spacetime Interval.

relativistic timeLorentz Transformation EquationsThe Geometry of Special Relativity: The Minkowski Space - Time Light ConeThe Geometry of Special Relativity: The Minkowski Space - Time Light Cone

A better expression for the speed of light combining time and space is 1 meter of light travelled in 1/299,792,458 seconds.

§ Corollary: 2nd Proof that the Proper Spacetime Interval ( or Proper Time ) is Lorentz Invariant:

relativistic time

That is, Lorentz invariance of proper time also demands that the Proper Time Interval is Lorentz invariant!

§ Meaning of the Lorentz invariance of the Proper Time Interval:

The Principle of Relativity ( Galilean - Newton or Einstein Special Relativity Physics ) states that the laws of physics are invariant in every inertial ( free - floating ) reference frame. Therefore, while different observers in overlapping relative, free - floating, frame motion to each other will assign different space - time coordinates to a the same event, relativistic time, the Principle of Relativity demands that the Lorentz invariant proper space - time interval possesses the same value as calculated by all observers in every overlapping free - floating frame of reference, but measured directly only at the "attached time" of the particle, body or on the wristwatch of a person in common sense terms.

relativistic time


Pythagorean Theorem Hidden in Lorentz Invariant Proper Time


relativistic time

Combining systems relativistic time and relativistic time, we get

relativistic time

§ Example:∗∗

An event  relativistic time  occurs in a relatively moving frame of reference such as a flash of light which is also viewed in a stationary frame of reference.

relativistic time

∗∗note : this example is used in the future upcoming Relativity Physics and Science Calculator Mac application for Proper Time.


Proper Time and Energy Revealed


relativistic time


relativistic time

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