in the horizontal mirror alignment is the same as the general orientation in the normal alignment with an alignment angle u03b8 n equal to 90 degrees fig2 b is a diagram illustrating rotation of the rotation sensor after the translations shown in fig2 a have been eliminated the translations shown in fig2 a can be eliminated by subtracting the delta motion of sensor a i e a u03b4x a u03b4y from the delta motion of sensor b i e b u03b4x b u03b4y fig2 b also shows the distance d between sensors a and b along with the angle of rotation u03b1 0141 fig2 a is a diagram illustrating various translations and negative rotations of sensors a and b in a horizontal mirror of the second special orientation fig2 b is a diagram illustrating rotation of the rotation sensor after the translations shown in fig2 a have been eliminated the translations shown in fig2 a can be eliminated by subtracting the delta motion of sensor a i e a u03b4x a u03b4y from the delta motion of sensor b i e b u03b4x b u03b4y fig2 b also shows the distance d between sensors a and b along with the angle of rotation u03b1 since the starting axis between.