0 the position of an object in the sky, expressed as an angle related to a distance on the horizon of the Earth -- 方位角；地平经度
Direction is expressed in azimuth and elevation angles in degrees.
The parameters that describe the rays' diffraction here are two, one more than for the ordinary: the altitude and the azimuth.
This is avoided by placing loudspeakers to the right-most and left-most directions (+ 90° azimuth).
The range bias r results from errors in leveling the sensor (azimuth error).
Note that the terms chromatic axis and azimuth are used interchangeably in this paper.
The visuotopic displacement of each pair was measured as the difference in azimuth between the centers of the two aggregate receptive fields.
The solid curve in each graph signifies the settings of the ideal observer that compensates for changes in test surface azimuth.
The horizontal axis for both graphs is used to plot either the azimuth or elevation of the test surface.
