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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    $\begingroup$ 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 Astronaut Sep 9 '19 at 18:57

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.

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