i. The angular movement of the offset of a camera axis about an aircraft’s longitudinal axis.
ii. The angle at the perspective center between the photograph perpendicular and the plumb line or another exterior reference direction. In aerial photography, the tilt may be separated into the component angles, referred to as the fiducial axes, with the axis one, or more nearly, in the direction of flight. In an aerial camera orientation, a tilt in the direction of the x-axis is known as a j (phi) tilt, and one in the direction of the y-axis is known as an w (omega) tilt.

Aviation dictionary. 2014.

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