Function spice_sys::phaseq_c

pub unsafe extern "C" fn phaseq_c(
    et: c_double, 
    target: *const c_char, 
    illmn: *const c_char, 
    obsrvr: *const c_char, 
    abcorr: *const c_char
) -> c_double

computes the apparent phase angle between the centers of target, observer, and illuminator ephemeris objects.