Shooting a crew rotating motion by video camera. (Without moving view angle.)
(2) Measuring rotating rate “R [s-1]” and translating speed “Vtrans [m/s]” by video image.
(3) Calculating “L” by L[m] = Vtrans [m/s] / R [s-1]
(4) Measuring length between center of stomach and chest “L” of the crew.
(5) Comparing with calculated L and measured L.
If both value of L are same, my theory is verified as correct theory.