  The AutoCAD is one of the most famous Computer Aided Drawing programs with
high and accurate specifications in the engineering design. It is highly
qualified and contains many of the tools it needs in many engineering
departments. A useful tool is the lighting tool because it gives a simulated
rendering of reality to a great degree that benefits the architect as well as
urban designers. This tool includes simulating sunlight by date during the
year, timing of day, and position of the body on the Earth. We tested the
sunlight status tools in this program in the limit of our test region to see
how accurate it was and it turned out to have a 45% error difference. The sun
shadow in AutoCAD rendering is longer than the real by 145%. There is another
error in the direction of shadow also. It is essential to note these errors for
any designer need to calculate the shadow length and direction from the AutoCAD
program.
