1. In tracking radar, a method of angular tracking in which the direction of the main lobe of the antenna pattern is slightly offset from the axis of the antenna. Rotation of the beam about the axis generates a cone with the antenna at the vertex and a vertex angle comparable in size to the beamwidth. Such an arrangement allows for accurate determination of the bearing and elevation of point targets, but is not used in weather radar. 2. In weather radar, the name sometimes applied to horizontal scanning because the surface swept in space by the beam as the antenna rotates in azimuth with fixed elevation angle is a cone.