Philosopher: In the 18th century, a paper on the absolutism of motion asserted that the change in position of one object over time could be measured without reference to the position of any other object  However, one respected physicist claimed that the paper was incoherent
Since an incoherent treatise cannot be considered a description of reality, motion cannot be absolute
Observing that something is certain under experimental conditions, it follows that it is the same under any conditions.