Orientation of one coordinate system relative to another is defined by a sequence of three successive rotations. The three Euler angles define one such body-fixed rotation sequence.
The three Euler angles,
Ψ,
Θ, and
Φ in Motion Analysis results are the sequence of Z-, X-, and Z-axis rotation angles measured about the body of the rotating coordinate system.
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Psi
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The first angle of rotation in the Euler angle rotation sequence. Ψ measures the rotation about the Z-axis of the rotating coordinate system.
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Theta
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The second angle of rotation in the Euler angle rotation sequence. Θ measures the rotation about the X-axis of the rotating coordinate system after the Ψ rotation has been applied.
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Phi
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The third angle of rotation in the Euler angle rotation sequence. Φ measures the rotation about the Z-axis of the rotating coordinate system after the Ψ and Θ rotations have been applied.
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