def illum(target, et, abcorr, obsrvr, spoint):
    """
    Deprecated: This routine has been superseded by the CSPICE
    routine ilumin. This routine is supported for purposes of
    backward compatibility only.

    Find the illumination angles at a specified surface point of a
    target body.

    http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/illum_c.html

    :param target: Name of target body.
    :type target: str
    :param et: Epoch in ephemeris seconds past J2000.
    :type et: float
    :param abcorr: Desired aberration correction.
    :type abcorr: str
    :param obsrvr: Name of observing body.
    :type obsrvr: str
    :param spoint: Body-fixed coordinates of a target surface point.
    :type spoint: 3-Element Array of floats
    :return:
            Phase angle,
            Solar incidence angle,
            and Emission angle at the surface point.
    :rtype: tuple
    """
    target = stypes.stringToCharP(target)
    et = ctypes.c_double(et)
    abcorr = stypes.stringToCharP(abcorr)
    obsrvr = stypes.stringToCharP(obsrvr)
    spoint = stypes.toDoubleVector(spoint)
    phase = ctypes.c_double(0)
    solar = ctypes.c_double(0)
    emissn = ctypes.c_double(0)
    libspice.illum_c(target, et, abcorr, obsrvr, spoint, ctypes.byref(phase),
                     ctypes.byref(solar), ctypes.byref(emissn))
    return phase.value, solar.value, emissn.value