The Grid Angle dialog box is used to change the angle of the grid. It is displayed by selecting Grid|Specify Grid Angle… The user then enters an angle (in degrees) in the edit box and clicks the OK button to change the angle of the grid as viewed from the top. The grid will be rotated around its center. The grid angle is measured counterclockwise from the X-axis. The axis of rotation is always vertical.
See also: “Specifying a Grid with Numbers” on page 16 and “Editing the Grid” on p. 33.