Okay Navin not a problem. take 24 hrs. I dont mind. Its due on wedensday/thursday. assume ball has radius 66 mm. and assume the weather to be Air temperature: -6.2 oC air pressure: 997.0 hPa,thank you very much, if you need any other clarification let me know. you can do it with ANY program, doesnt matter. C, java, matlab, maple. etc.,so do you accept?,was 24 hrs enough ? can it be done by tonight you think?