Godlike Productions - Discussion Forum
Users Online Now: 1,804 (Who's On?)Visitors Today: 347,349
Pageviews Today: 666,539Threads Today: 285Posts Today: 6,073
11:25 AM

Back to Forum
Back to Forum
Back to Thread
Back to Thread
Subject Gravitational time dilation is a PROVEN FACT, with PRACTICAL effects in GPS sattelites. There is no such thing as "present".
User Name
Font color:  Font:

In accordance with industry accepted best practices we ask that users limit their copy / paste of copyrighted material to the relevant portions of the article you wish to discuss and no more than 50% of the source material, provide a link back to the original article and provide your original comments / criticism in your post with the article.
Original Message Gravitational time dilation is the effect of time passing at different rates in regions of different gravitational potential; the lower the gravitational potential, the more slowly time passes. Albert Einstein originally predicted this effect in his theory of relativity and it has since been confirmed by tests of general relativity.

This has been demonstrated by noting that atomic clocks at differing altitudes (and thus different gravitational potential) will eventually show different times. The effects detected in such experiments are extremely small, with differences being measured in nanoseconds.

Gravitational time dilation was first described by Albert Einstein in 1907[1] as a consequence of special relativity in accelerated frames of reference. In general relativity, it is considered to be a difference in the passage of proper time at different positions as described by a metric tensor of spacetime. The existence of gravitational time dilation was first confirmed directly by the Pound–Rebka experiment.


Experimental confirmation

Gravitational time dilation has been experimentally measured using atomic clocks on airplanes. The clocks aboard the airplanes were slightly faster with respect to clocks on the ground. The effect is significant enough that the Global Positioning System's artificial satellites need to have their clocks corrected.[2]

Additionally, time dilations due to height differences of less than 1 meter have been experimentally verified in the laboratory.[3]

Gravitational time dilation has also been confirmed by the Pound–Rebka experiment, observations of the spectra of the white dwarf Sirius B and experiments with time signals sent to and from Viking 1 Mars lander.

source: [link to en.wikipedia.org]
Pictures (click to insert)
 | Next Page >>