Black hole explanation

The Doppler shift phenomenon is well known to everyone through ambulance siren scenario. When ambulance van approaches us we hear a higher sound, and analogously, when going away the sound appears lower.
The average speed of sound through air, at average temperature and density is about 345 meters per second. If the sound source moves towards us, the sound waves got shorter so what we hear is a higher frequency resulting with perception of higher sound. Analogously, when the distance between us and a sound source increases, the sound waves gets longer with a results of lower sound perception. Described effect is the same for the case if we move and ambulance car stays still.
If van speed moving towards us gets faster, the sound frequency perception increases correspondingly. Further accelerating the sound gets higher and if the van gets fast enough, at one moment the sound disappears from our upper frequency hearing range.
The same applies for the opposite scenario. When ambulance car distance between us continue to increase, sound waves gets longer, and at certain speed it disappears from our lower frequency hearing range.
When the speed of increasing distance between us and sound source reaches speed of sound, the waves we perceive become flat line and there is no way for us or our instruments to register it.

Although it is the same thing, the Doppler effect in astronomy is rather called a spectral shift. The only difference is that what we deal with in astronomy is speed of light.
So the same thing happens when distance between us and light source decreases or increases. In first case, the light waves gets denser, which means shorter, so the light we see shifts towards blue part of spectrum. If the distance between us and a light source increases, the light waves stretches with consequence of spectral shift towards red.
If the speed of distance increasing between the light source and us reaches our RF speed of light, the light source disappears from our perception frustum range. It becomes a flat line so there is no way for us or our instruments to register it.

The stone in a free fall on celestial body which gravitation “g_d” equals, or is greater, than our RF speed of light, falls faster then our perception.

It means that we cant perceive it.

Since gravitation is not a force but measure of space-time stretching, means that in one second of our RF time, space of observed celestial body stretches for our RF speed of light amount.
Although it appears as particles and waves are emitted from the gravitational source, as asserted in “Universal principle of speed of light” the resulting direction of attraction is always towards bigger gravitational system.
When celestial body gravitation is equal or larger then our speed of light, means that the speed of its space is equal or larger than speed of our perception.
Our perception would be a runner chasing another runner which speed is equal or faster than his own. So he would newer catch him. In astronomy, this phenomenon is denoted as “Black hole”.
In “Universal principle of perception” the “Black hole” scenario is explained through equations describing space-time-velocity relations.