$gravity 
  JEARTH = 
  0.10826261D-02  ,  -0.25325160D-05 ,  -0.16185635D-05 ,  -0.22666923D-06 ,
  0.53907866D-06  ,  -0.35360681D-06 ,  -0.20155052D-06 ,  -0.11709050D-06 ,
  -0.24775699D-06 ,  0.23722022D-06  ,  -0.17814270D-06 ,  -0.20842886D-06 ,
  0.11607657D-06  ,  -0.17969918D-07 ,  0.35553786D-07  ,  -0.10309720D-06 ,
  -0.51853260D-07 ,  0.13458402D-07  ,  -0.12757446D-06 ,  -0.39970223D-07 ,
 $end
 $constants
  earth_rad = 6378.137
  mu_earth = 398600.436
  mu_moon = 4902.7927809104D0
  mu_sun = 132712441933.00783456D0 
  mu_moon = 0.4902799140594720D+04
  mu_sun = 0.1327124399354841D+12
  sid_day = 86164.09055 
 $end