just to split a really fine hair, the center of gravity is a point in space. If you freely suspend the airplane from any point, (Wingtip, left wheel, propeller.....) the Center of gravity (or more correctly the center of MASS) will be directly below the point where the plane was suspended. The center of MASS will most likely be somewhere inside the fuselage.

You have just told him how to find the Balance point, which is a point along the wing chord where the plane will balance fuselage-level if you suspend it from that point. If the center of mass is above the balance point the plane will fall over. That's why you have to balance a low wing plane upside down.

I know....picky picky.

And it's not really true that we honor Carl Goldberg by writing his initials next to the center of Gravity.