25 which is movable in the vertical direction the light source 16 being supported by the slide the light source accordingly can be shifted vertically to different positions by means of the motor and the operation of the motor is controlled by output signals from a computer so that the light spot generated by the light source when observed from a defined fixed position at the right end of the sight will be positioned automatically in dependence of relevant parameters supplied to the computer such that the sight line will intersect the ballistic curve on the target motor 24 can be located in a box at the lower side of frame 22 so that only slide 25 with light source 16 at the upper end thereof projects from the upper side of the frame in fig3 only the position along a vertical axis the y axis is controlled in the embodiment disclosed in fig4 motor 24 having light source 16 mounted to slide 25 thereof also the position along a horizontal axis the x axis is automatically controlled in fig4 motor 24 is mounted to the slide 26 of a second motor 27 slide 26 being movable along the x axis by means of motor 27 while slide 25 is movable along the y axis by means of motor 24 light source 16 accordingly can be adjusted in two mutually perpendicular directions by means of the two motors 24 and 27 the same result can be achieved by means of a single motor 24 if the light source is a diode array vertical cavity surface emitting laser vcsel 28 mounted to slide 25 of motor 24 as shown in fig5 the slide is movable by means of motor 24 along.