Disclosed herein are systems and methods for angle measurement. According to one embodiment, the angle of rotation between a first movable portion of the device and a second fixed portion of the device is measured based on the times when a plurality of marks on a third rotating portion of the device are sensed by a plurality of sensors on both the first movable and the second fixed portions of the device. The embodiment utilizes an electronic computation device to analyze the times and provide an accurate measurement of the angle.
