I think the correct answer is - "On Orbit typically is used to refer to where an action, experiment, or operation is taking place - https://www.theatlantic.com

I think the correct answer is - "On Orbit typically is used to refer to where an action, experiment, or operation is taking place - https://www.theatlantic.com/technology/archive/2014/11/grammar-in-space-are-you-in-orbit-or-on-orbit/381522/ https://www.theatlantic.com/technology/archive/2014/11/gramm... The Atlantic asks NASA and they in turn look at the reports and say the above, but strangely The Atlantic ends up with a English professions definition which is what Stack perhaps repeats. Google seems to agree it's actions if you look at results. It's servicing, rendezvous and capture, refueling, assembly, breakups