The Luiza effect it is the propriety of light that allows it to see the photon emitted by a light source A at velocity v, which always comes from the same position, regardless of modulus v.

Functioning of light

     While light rays are dragged by velocity v of its source, the photons of each light ray are at c₂, where c₂ = c + v,  that causes that their trajectories are different from their rays´ trajectories.

     If a light ray has a motion at velocity v, an observer on referential of such source does not know his velocity v, but an observer standing still in relation to this motion is the only one that knows such velocity.

     Thus, the observer standing still sees that the source drags with it all light rays emitted by it that causes that photon has two velocities:

         - c, which is the emission velocity of photons that belong to rays of such source;
         - v, which is the deviation velocity of source;

     The composition of both velocities causes that each photons that were emitted by this source has its own
velocity c₂, where c₂ = c + v.  Such photons´ velocities and their real trajectories are unknown by the observer on referential of source. He just knows the velocity of emission of photons c, because he thinks he is standing still
and, therefore, he is not able to know the component of velocity v of photons.

     It is impossible for us, on the referential of earth, to know all velocities of earth, such as: rotation velocity,
translation, expansion of universe and so on.

     Hence, we do not know the real trajectories and velocities of photons of light sources that are located on earth. An observer, standing still in relation to such velocities, is the only one able to know the real trajectories and velocities of
such photons. Thus, our science is deceived due to it does not know the real functioning of light in which the light rays
are dragged by velocities v of sources as long as their components – photons – have trajectories and velocities c₂
different from trajectory and growth of light ray that are at velocity c.

Source standing still

     Both observer on referential B and observers standing still on the generic positions An will see the same, due to both are on the same referential. Thus, each one of them and the observer on the referential B will see their light ray emitted by a light source on generic positions A_n, reaches body B. The photons of each one of such light ray will cover a distance D₀ at velocity c, in a time  t₀, where t₀ varies according to the size of trajectory D0 of each ray.

Source with a motion at velocity v

     An observer on a source referential at a constant velocity v thinks he is standing still. In each one of generic positions A_n that he shall be on he will see the light ray that will reach body B in the same manner that he would see if he was standing still. Thus, at the moment that he cross over the position A₂, he will see the light ray emitted from this position characterized by angle of its emission, grows from position A to position B, at velocity c,  in a time t₂ , as long as at this same time t₂  it goes from  A₂  position to A.

     An observer standing still on B referential, who knows the velocity v of source, would see photons of such source be influenced by velocity v that causes that the velocity of photon changes from c to c₂ where c₂  = c + v observing this photon emitted from A₂ position goes, in its own trajectory, from A₂ position to B position at velocity c₂  in a time t₂. 

     At the same time that such photon arrives at B position, the source also arrives at A position and all photons emitted by the source, as long as the source went from A₂  position to A position, will have covered their own trajectories at velocity c₂  forming a virtual light ray that connects the source on A position to the body on B position.

     This ray is unreal because, none photon of such virtual ray have covered the AB trajectory. The photon that went out from A₂ position was the only photon of such ray, which was emitted by such source, that arrived at body B, arriving at position B as it had came from A position.

     In the left of figure, we can see the diagram of velocities v, c e c₂.

    In a time t₂:

         - The source goes from A₂ position to A position at velocity v covering a distance E, where E = v x t₂;
         - The photon goes, in its real trajectory, from A₂  position to B position at velocity c₂ covering a distance L;
         - For an observer on A referential that in his truth thinks he is standing still, the light ray increases with the
           velocity c and it is dragged by such velocity going from A position to B position.

     Due to we are seeing how the figure was done, we know that the light ray increased distance D as long as the source went from A₂  position to A position. We also know that such ray arrives at A position at the same time that it is crossing over B position and it seems that it was instantaneously transmitted between A and B positions, according to Cristina effect. The only photon of such ray arrived at B as it had arrived at velocity c coming from A position and also that none photon of such ray had covered AB distance.

     Thus, for any velocity v of source, when such source cross over A position, the observer on B will see such source as its light had came from A position in a time tn that would be the same time that the source would do from A_n position to A position. Such photon would be emitted from A_n position in direction of a and it would go from A_n  position to B position at velocity c_n describing the A_nB trajectory, where c_n = c + v´, being v´ the new velocity v of source.

     Thus, for na observer on B, the real position of A would be in direction of A, but in a distance D = c x t_n.

Source at velocity 2v.

     If a source is at a velocity that is a double of velocity v, it means, 2v, the ray that arrives at body B will be that same ray that forms an angle a with vertical and an angle b´ with the trajectory of source. Such ray exists since that light was turned up, on A_n position and its photon that arrives at B point is that one emitted from A₄ position. The real ray’s direction is c´₂  where c´₂ = c + 2v.

     In the same time t :

          - The photon will cover its real trajectory of length L´ at velocity c´₂ ;
          - In the trajectory E´ of source, it goes from A₄ to A at velocity 2v;
          - An observer on A position, in his truth, thinks that he is standing still seeing a photon goes from A point
            to B point at velocity c covering the trajectory D´. Each photon of such ray will be at velocity c´₂  where
            c´₂ = c + 2v.

     Thus, we will see the right side of figure with a new diagram of velocities, where:

     In a time t :

          - The source goes from A₄  position to A position at velocity v covering a distance E´, where E´ = 2v x t;
          - The photon goes from A₄ position to B position at velocity c´₂ , where c´₂ = c + 2v, covering a distance L´;
          - for an observer on the referential of source that, in his truth, he thinks he is standing still, the light ray 
            increases at velocity c and it is dragged by velocity 2v going from A position to B position.

     An observer on B referential sees the photon emitted by a source A, which is standing still on A₀ position,
arrives at him at velocity c, after it had covered the trajectory A₀B of length D₀ in a time t₀. If such source is
at any velocity v the photon will cover its real trajectory A₂B of length L at velocity c₂ in a time t, as long as
the source goes from A₂ position to A covering a distance E, where E = v x t. But, when such photon arrives at
body B it will look like it came from A position at velocity c covering a distance D in a time t misleading the
observer on B referential.

     At any other velocity of source, such as 2v, the photon will arrive from A₄ position covering a distance L´,
at velocity c´₂, where c´₂ = c + 2v, in a time t, as long as the source goes from A₄ position to A covering a
distance E´ at velocity 2v, in a time t. When such photon arrives at body B it looks like it came from A position
covering a AB trajectory of length D at velocity c in a time t, misleading the observer on B.

     We must remember that none photon has covered this illusory trajectory AB. Each photon of such illusory ray
AB went from the position that a source was on its emission moment when the influence of the velocity v of
source caused that the velocity c changed to c₂ ,where c₂ = c + v covering its own trajectory parallel to A₂B
direction toward its position on thelight ray AB if the velocity of source is equal to v.

     In case of any other velocity of source, each photon of such illusory trajectory AB was emitted from the
position the source was on the moment of its emission, when the influence of velocity of source causes that
velocity c changes for c´₂  where c´₂ = c + 2 v covering its own trajectory parallel to direction toward its position
on the light ray AB.

     We conclude that the observer on B referential is deceived by the functioning of light because as in the
example given c₂ and c´₂  he does not know the arrival velocities of photons and he also thinks that photons
came from A position, which is in the same direction as A₀, traveling the trajectory of distance D, at velocity c, in a
time t, at any velocity v of source.