pub unsafe extern "C" fn tangpt_c(
method: *mut i8,
target: *mut i8,
et: f64,
fixref: *mut i8,
abcorr: *mut i8,
corloc: *mut i8,
obsrvr: *mut i8,
dref: *mut i8,
dvec: *mut f64,
tanpt: *mut f64,
alt: *mut f64,
range: *mut f64,
srfpt: *mut f64,
trgepc: *mut f64,
srfvec: *mut f64
)