It doesn't matter what anyone ``thinks''; the calculation is straightforward to do in flat spacetime (where special relativity would be sufficient) and in curved spacetime (where general relativity would be necessary).

This forum is meant to show the disconnect between official propaganda and reality!

The answer is quite clear and evident from the references cited in the introduction, for everybody to see. The engineers who were involved in the development of the GPS and use this in practice, assert that SR and GR have no role in this technology.

On the contrary the shameless “scientist serfs” and medieval-type priests use megaphones singing hymns to big-up the brain-cooked theories and ruling ideas, purely for propaganda.

It has been clearly demonstrated; scientifically, mathematically and philosophically that Einstein’s theories of relativity are just geometry/mathematics driven and fantastic thought-products that have absolutely no basis in objective reality. “The Mystery of the Lorentz Transform: A Reconstruction and Its Implications for Einstein's Theories of Relativity and cosmology” : INSPIRE>HEP: https://inspirehep.net/literature/2158754

GPS use the Sagnac effect, relativity is of course not needed

https://www.nasa.gov/image-article/einsteins-theory-of-relativity-critical-gps-seen-distant-stars/

The clear answer to this question is no. Space agencies, at least NASA, do not recommend using calculations for time dilation due to motion such as SR or gravitational potential differences such as GR. Instead NASA sponsored research to ensure corrective measurements for GPS time distortions - which causes by a variety of causes, and so NASA implemented the recommendations of research it sponsored decades ago.

I have my own research that reveals wave equations with classical mechanics that would be suitable for solving time distortion problems with GPS satellites.

Note: I used the term "time distortion" instead of "time dilation", also time dilation equations alone are insufficient when applied for practical purposes and certainly for time correction measurements on GPS satellites.

As an electronics engineer, I can say that employing an electronic signal comparator (which costs only one or two cents here in India) on a GPS satellite, can easily measure the time difference compared to ground conditions and suggest the level of comparator error. As for the automatic correction of time distortion required on GPS satellites, this is not a major problem, or even a common one on Earth.

I don't understand why so many knowledgeable persons are so obsessed with time dilation instead of relying on classical mechanics, when classical mechanics and application of wave equations can be a better option to handle such problems than using inadequate time dilation equations. I completely dismiss the idea of time dilation because time is not something to dilate, unless one invites error into it.

And indeed, Sagnac effect is relevant, as Mr. Halim Boutayeb stated, NASA sponsored research too considered Sagnac effect in relevant research involving GPS time difference long ago.

I simply discard time dilation in SR for valid reasons.

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Issam Mohanna

Your above comment represents a definitive answer to the original question, which is not and needs to be looked at differently. As you note from NASA's observation, "The answer is an effect from Einstein’s General Theory of Relativity called the “gravitational redshift ..." The statement appears to be relativistic bias, because the redshift in light is not the only significance. There are many and not only 'gravitational red shift'. The observations posted by NASA do not reveal the full picture of redshift, and "gravitational redshift" is not the only significant cause of redshift in light.

Redshift is a natural phenomenon caused by various causes, and not significantly due to gravitational redshift, here is a list of causes of redshift in light.

1. Propagation Delay or, Time Delay: First and foremost light should cause its own propagation delay or transmission delay or time delay. Propagation delay is the amount of time required for a signal to be received with light after it is sent; This is caused by the time it takes for the signal to travel through a medium or void in space. Propagation delay is of primary interest in electronic circuit design and computer networking, although all signals will inherently experience some form of propagation delay. As light travels a distance of 1 km in a vacuum, there will be a time delay or delay of 3.33 microseconds (µsec). Time delay (Δt) corresponds to wavelength enlargement Δλ as we know t ∝ 1/f or t ∝ λ. This increase in wavelength will cause a red shift as it accumulates over time.

2. Doppler redshift: As an object moves away from the observer, the light waves emitted by the object are enlarged, causing them to have a lower pitch and moving them towards the red end of the electromagnetic spectrum, where the wavelength of light is longer (λ+Δλ). Blue shift occurs when the phenomenon described above is reversed.

3. Gravitational Redshift: The phenomenon that electromagnetic waves or photons escaping a gravitational well expend their energy resulting in longer wavelengths (λ+Δλ), which shifts the frequency of light towards the red end of the electromagnetic spectrum resulting in gravitational redshift.

4. Photometric Redshift: Photometric redshift is an estimate of the deceleration velocity of an astronomical object such as a galaxy or quasar, where Doppler redshift can replace the deceleration velocity.

5. Cosmic Redshift: The universe is expanding, and that expansion stretches light through interstellar space in a phenomenon known as cosmic redshift. The higher the redshift, the more distance the light has travelled.

By this time, you probably understand why NASA's observation of “gravitational redshift, not just redshift as you seem to present in the existence of different redshifts.

The final redshift is calculated based on the effective redshift, and in this context, one can see my research papers available on my ResearchGate profile.

Best regards

Soumendra Nath Thakur

Besides, Issam Mohanna

relativistic time or time dilation is not redshift. As time distortion can cause in objects with mass but redshift causes in electromagnetic waves having massless photons.

Regards,

Soumendra

Dr. Stam Nicolis

But it really matters when preconceived special relativity mistakenly represents time dilation rather than time distortion, and when time, or even the time scale itself, is something that is not dilatable. One cannot dilatate time or its scale, unless one invites error into time.

So-called, straightforward special relative time confidence is set aside.

Also, a GPS time is relevant to the gravitational potential difference, so special relativity is not the only consideration in GPS time measurement, GR deals with gravity, not SR.

Regards

Soumendra

So, the question is, why is a wrong theory so worshipped by scientists?