For the initial explanation of the theory of relativity

Modern Interpretations of the Theory of Relativity:

Calculate at the same time that the watches of people on Earth and passengers on airplanes fall on the floor, and the speed of the fall is the slow of the plane's falling and falling.

The law of relativity twins: A pair of 6-year-old twin brothers get on a faster-than-light alien spaceship and come back a year later to find that the younger brother is 80 years old.

The astronauts on the space station came back 1 minute younger than their colleagues on Earth.

The theory of constant speed of light holds that the speed of light in a vacuum is constant and has limitations, ignoring the wave-particle duality of photons and the influence of adjacent masses in the transmission channel. Tachyonists, on the other hand, believe that tachyon particles (tachyons) will always exceed the speed of light, and that they will always be able to move only faster than the speed of light, but not slower than the speed of light. As their energy gradually increases, they gradually approach the speed of light, and when their energy is infinite, their speed is infinite.

Initial explanation of the theory of relativity:

When Einstein was a child, there was a handicraft class in which the female teacher asked the students to make a piece. He wanted to make a small wooden stool. The bell rang at the end of class, and the students scrambled to take out their work and hand it to the female teacher.

Einstein didn't come up with his own work, and he was so anxious that he was sweating profusely. The female teacher looked generously at this boy, who was very good at mathematics and geometry, believing that he would be able to hand in a good work.

The next day, Einstein handed the governess a small, crudely made bench with one leg crooked. The expectant governess said, "Have any of you ever seen such a bad stool?"

The students shook their heads. The teacher looked at Einstein again and said angrily, "I don't think there will be a worse stool in the world."

There was a burst of laughter in the classroom.

Einstein's face was red, and he walked up to the teacher and said to the teacher with certainty: "Yes, teacher, there are worse stools than this." The classroom fell silent and everyone looked at Einstein.

He walked back to his seat, took out two smaller, rougher benches from under his desk, and said, "This is the first and second time I have made, and the third wooden bench I gave to the teacher just now." Although it is not satisfying, in relative theory, it is always better than the first two.

His classmates also cast their eyes of admiration and approval at him.

Since then, Einstein's theory of relativity has spread on campus. Later, he became a scientist and went one step further to develop the general theory of relativity in cosmic physics.

In my opinion, what you think is problematic. It is not the problem of the person receiving the light signal, but the problem of the light signal transmission itself. This is due to the limitation of the propagation speed of the (optical) signal itself, regardless of what is receiving the signal.

The most basic explanation is that time, space, and mass will vary depending on the frame of reference, and we usually speak of an inertial frame of reference, while the theory of relativity is a non-inertial frame of reference.

This is a real physical process that has nothing to do with the time difference in which the light signal is received. The two are not the same thing at all. It is rigorously deduced step by step from the formula.

You go and learn about the Lorentz transformation, which describes the position of matter in space-time, because the speed of light is constant, the relevant quantities in physics are closely related, so everything else including coordinates, time, velocity, mass, energy, etc. will change as a result.

In addition, I would like to tell you that the description of motion requires a reference object, and the person himself is a reference object, and the movement will become meaningless without the reference object. Therefore, it is impossible for you to say that "measurement" is not "limited by people themselves", and where does "measurement" come from without "people"? The two are inherently symbiotic, and even if you close your eyes, the light signal will still be based on you.

Movement itself is a subjective description of an object by man. Unless there is somewhere in the universe where there is nothing in it, no object can move independently of the reference of other objects.