Past Light
From Pic 1, we can see both the light and the planet A....But because the light takes a time to travel (millions of light years) and result the lights that we see are come from the past.
In fact, planet A has moved, but we still see the light from planet A as in Pic 2
When planet A moves, we also move....And result the image or light that we see from planet A is always come from the past too (Pic.3)
The 2 Dimension
Past Light
The 3 Dimension
Calculation
Position
