I have seen the term "moment reference center" and from a general perspective, I understand that it is a point arbitrarily chosen to calculate moments acting on a entry vehicle (I am reading a lot on entry aerodynamics), my background is not in aerospace so I am trying to learn this on my own.
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2$\begingroup$ This is a great question! In aviation, the Aerodynamic center is chosen as the pitch moment reference center because it makes the calculations much simpler: within the flight envelope, the pitch moment remains approximately constant relative to that axis. I wonder if there's anything similar for rockets. $\endgroup$– Everyday AstronautSep 9, 2019 at 18:57
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It's nothing more than what you say. A moment only makes sense about some axis. So you might as well choose all three axes to intersect at a point, just to simplify your calculations.
answered Sep 9, 2019 at 18:45