Press and hold shift while moving an object to snap to a path of movement that is in 15-degree increments from the original position. You can use this technique to constrain the object's movement to a vertical path (0 degrees or 180 degrees) or a horizontal path (90 degrees or 270 degrees). Using shift in this way overrides the Snap to Rulers command in the Tools/Snap menu, if necessary, to constrain to the 15-degree angle.