integer*8 peph
integer res
double precision jd0
double precision dt1
double precision PV(6)
jd0 = 2442457
dt1 = 0.5D0
res = f90calceph_open(peph, "example1.dat")
if (res.eq.1) then
! the heliocentric coordinates of Mars in km and km/s
res = f90calceph_compute_unit(peph,jd0, dt1, 4, 11,
& CALCEPH_USE_NAIFID+CALCEPH_UNIT_KM+CALCEPH_UNIT_SEC,
& PV)
write(*,*) PV
! compute same quantity as the previous call using NAIF ID
res = f90calceph_compute_unit(peph,jd0, dt1,
& NAIFID_MARS_BARYCENTER, NAIFID_SUN,
& CALCEPH_USE_NAIFID+CALCEPH_UNIT_KM+CALCEPH_UNIT_SEC,
& PV)
write(*,*) PV
call f90calceph_close(peph)
endif