Hi porf, i have other question, for example if i want to control by value to change postion of the satellite not by drag using mouse, however
for example at applet $y=R*2$ so i change the value to $y=R*1.5$ the satellite become near from the earth.
How i can add three diffrent postions to satellite for i can change value using value input not using drag satellite image, for example i put 1.5 and click enter so satellite postion change to
this postion also if i change the value fro 1.5 to for example 2 etc..
thanks,