extern int otb_6s_possol_(
  otb_6s_integer *month,
  otb_6s_integer *jday,
  otb_6s_doublereal *tu,
  otb_6s_doublereal *xlon,
  otb_6s_doublereal *xlat,
  otb_6s_doublereal *asol,
  otb_6s_doublereal *phi0
  );
extern int day_number_otb_6s__(
  otb_6s_integer *jday,
  otb_6s_integer *month,
  otb_6s_integer *ia,
  otb_6s_integer *j
  );
extern int pos_fft_otb_6s__(
  otb_6s_integer *j,
  otb_6s_doublereal *tu,
  otb_6s_doublereal *xlon,
  otb_6s_doublereal *xlat,
  otb_6s_doublereal *asol,
  otb_6s_doublereal *phi0
  );
