Nanosecond precision is a requirement for telemetry communications between NASA and its space probes such as the Mars Lander.

Instructions on when to fire on board thrusters to achieve an orbit or soft land on a surface must be precise and arrive on time if these and other procedures are to be executed properly.

The slightest misstep can and does cause disaster.

Yet the same dilemma exists here as in the hypothetical Moon laser experiment.

Without knowing the actual, not relative, velocity and trajectory of Mars , in this instant, how could the electromagnetic signal, traveling at the speed of light, arrive at the exact precise moment intended unless the signal velocity and trajectory were modified by the medium it traveled through to conform to the relative motion of the Earth and Mars, clear evidence of the force field in action.

And what of the Mars Lander itself? See bullet drag experiment.

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