I do not know is you guys realized by now but I am not a physicist... Noooo... really, I am not!!!
When describe how things are moving, and when you want to be accurate about it, you need to pay attention of the terms in which you describe the motion. Most of the time scientists are paying a close attention in choosing the terms/words they want to describe something because they want to represent nature as accurately as possible.
Language can often be imprecise, especially when you are a scientist, aware being that statements can often be misinterpreted.
However, as I mentioned before, I am not a scientist nor I pretend to be, therefore there is no need for some of you to flame me and be cocky about my lack of better terms.