Heliocentric is sensible for us humans here on this planet. It's
   enough to get us to the outer part of the solar system and
   around the various gravitational fields without much fuss.

   And yes, the moon could rationally be said to be the center of
   the Universe if one wishes.

   Example:
   12 men in the history of humanity set foot on the moon.

   Each of us, from our perspective is at the center of the
   Universe.

   For those 12 men, the moon was at the center of the universe at
   the time that they were on it. All of the Universe revolved
   around them. And it did. It's not practical to be standing on
   the moon and considering how you're seen from a heliocentric
   point of view nor from a geocentric point of view, unless you
   want to hurt your brain.

   But if you want the ship's systems to get you home, you need a
   combination of heliocentric, geocentric and lunarcentric to get
   you back; whatever fits the calculations needed.

   I imagine a lunarcentric was more important in launching back to
   earth from the moon.