 radius sun(m),radius planet(m),mass sun(kg),mass planet(kg)
     0.7E9        6400.0E3        2.0E30        6.0E24 
 sun potential(V), sun mag. moment
     1000.0        0.1E23
 dt(days),nsteps,velplanet(m/s),initial position(x,y,z)(m) 
   0.0001    400   60.0E4           0.7E9 0.0 0.0       
 every nprint step printed
  2
