The tracker basically calculates the astronomical position of the sun at any particular point of time at a particular location and controls the actuator accordingly to move the panel to the target angle. The calculation of the next target angle at the next target time is calculated and the tracker accordingly activates the output when the target time has been reached. The calculation of the target angle depends upon the sunrise and sunset times for the particular date. The principle lies in that the sun moves from the east horizon from sunrise to the west horizon till sunset for a total of 180 degrees. The unit calculates the target angle according to the following limits: