The light dynamic between a fount A and a receiver B in uniform rectilinear motion relative v on the same reference point

The photon

The observer on the fount A as a reference point

This observer thinks that he is stopped. He does not know his expansion velocity v on the universe, he only knows his velocity v of the receiver B.
Photons emitted by fount A, when the receiver B is at position B₁, the photon that will reach the receiver B is the one that makes an angle d with the direction AB₁.
While the receiver goes from position B₁to B with velocity v, the photon goes from position A to the position B with velocity c.
When this photon reaches the body B, due to both velocity v of B and aberration effect, it modifies its velocity from c to c₃, where c ₃ = c – v.

The observer on receiver B

This observer thinks that he is stopped at position B and it exists a relative velocity –v of the fount. Photons emitted by the fount A, when it is on position A’, the one that will reach the body B is that one that makes an angle d with A’B direction.
While the velocity goes from position A’ to A with velocity v, the photon approaches to B with c₃ velocity, where c₃ = c – v.

The observer on absolute space as a reference point

This observer knows the expansion velocity v of the universe to A and B bodies as a reference and velocity v of the body B when compared to body A.
Photons emitted by body A at position A₀, the one that will reach the body B is that one that makes an angle d with A₀B₀ axle, where d is a v function. This photon is influenced by the expansion velocity v of the universe and it acquires the c₂ velocity, where c₂ = V + c.
At the same time:

- The photon goes from position A to position B, with c₂ velocity;
- The body A goes from position A₀ to position A, with v velocity;
- The Body goes from position B₀ to position B, with U velocity where U = V + v.
When the photon reaches the body B, due to both U velocity of B and aberration effect, it modifies its c₂ velocity to c₃, where c₃ = c₂ – U or c₃ = c – v.

The light Ray

The observer on fount A as a reference point

Photons emitted by fount A, during body trajectory B from position B to B₂ and that will reach B, will create a curve light ray that connects the body A to body B.

Observer on B receiver as a reference point

Photons emitted by body A, and that will reach B, during the body trajectory A from position A’ to A, will create a curve light ray that goes from position A to position B.

Observer on absolute space as a reference point

Photons emitted by light fount A, that will reach body B, during trajectory A from position A₀ to A, will create a curve light Ray, connecting position A to B.