Vertical Bat Angle is the angle of the bat with respect to horizontal at the moment of impact. Vertical Bat Angle is measured in degrees and provides the location of the barrel of the bat relative to the knob of the bat at impact. Vertical Bat Angle will be zero when the barrel of the bat and the knob are parallel to the ground. Vertical Bat Angle will be negative when the barrel of the bat is below the knob of the bat at impact.