Function eraApio13 

pub unsafe extern "C" fn eraApio13(
    utc1: f64,
    utc2: f64,
    dut1: f64,
    elong: f64,
    phi: f64,
    hm: f64,
    xp: f64,
    yp: f64,
    phpa: f64,
    tc: f64,
    rh: f64,
    wl: f64,
    astrom: *mut eraASTROM,
) -> c_int