in which each of the " values is a different phase angle.
Knowing the motions of and about the center of gravity, G, one can calculate the motions in any point on the structure using superposition.
The phase shifts of these motions are related to the harmonic wave elevation at the origin of the steadily translating O(x;y;z) system, the average position of the ship’s center of gravity - even though no wave can be measured there: