integer*8 peph
integer res
double precision jd0
double precision dt1
double precision P(3), PVAJ(12)
jd0 = 2442457
dt1 = 0.5D0
res = f90calceph_open(peph, "example1.dat")
if (res.eq.1) then
! compute only the heliocentric position of Mars in km
res = f90calceph_compute_order(peph, jd0, dt1,
& NAIFID_MARS_BARYCENTER,
& NAIFID_SUN,
& CALCEPH_USE_NAIFID+CALCEPH_UNIT_KM+CALCEPH_UNIT_SEC,
& 0, P);
write(*,*) P
! compute positions, velocities, accelerations and jerks of Mars in km and seconds
res = f90calceph_compute_order(peph, jd0, dt1,
& NAIFID_MARS_BARYCENTER,
& NAIFID_SUN,
& CALCEPH_USE_NAIFID+CALCEPH_UNIT_KM+CALCEPH_UNIT_SEC,
& 3, PVAJ);
write(*,*) PVAJ
call f90calceph_close(peph)
endif