integer res
real(8) jd0
real(8) dt1
real(8) PV(6)
TYPE(C_PTR) :: peph
jd0 = 2442457
dt1 = 0.5D0
peph = calceph_open("example1.dat"//C_NULL_CHAR)
if (C_ASSOCIATED(peph)) then
! the heliocentric coordinates of Mars in km and km/s
res = calceph_compute_unit(peph,jd0, dt1, 4, 11,
& CALCEPH_UNIT_KM+CALCEPH_UNIT_SEC,
& PV)
write(*,*) PV
! compute same quantity as the previous call using NAIF ID
res = calceph_compute_unit(peph,jd0, dt1,
& NAIFID_MARS_BARYCENTER, NAIFID_SUN,
& CALCEPH_USE_NAIFID+CALCEPH_UNIT_KM+CALCEPH_UNIT_SEC,
& PV)
write(*,*) PV
call calceph_close(peph)
endif