Function spice_sys::spkpos_c

pub unsafe extern "C" fn spkpos_c(
    targ: *const c_char, 
    et: c_double, 
    reff: *const c_char, 
    abcorr: *const c_char, 
    obs: *const c_char, 
    ptarg: *mut c_double, 
    lt: *mut c_double
)

returns the position of a target body relative to an observing body.