In the course of discussing light physics and vision, the question has been asked how the actual location of a planet, say Mars, is determined and if the calculation uses the apparent location as a variable, and if the calculation corrects for the light speed time delay. If we can get an actual formula and brief explanation, that would be most helpful.
I think this question is fairly elementary, but our interlocutor at another board remains dissatisfied with our answers, and would like input from experts. Here is the actual question:
"When sending rockets to other planets, do scientists take into account that the image of a planet produced by a telescope shows a delayed true location, due to the finite speed of light?"
Although redundant, I have been asked to include this addendum
"does this delay factor into the equation which determines the actual location of the planet?"
Thanks in advance for any input.