def unorm(v1):
    """
    Normalize a double precision 3-vector and return its magnitude.

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

    :param v1: Vector to be normalized. 
    :type v1: 3-Element Array of floats
    :return: Unit vector of v1, Magnitude of v1.
    :rtype: tuple
    """
    v1 = stypes.toDoubleVector(v1)
    vout = stypes.emptyDoubleVector(3)
    vmag = ctypes.c_double()
    libspice.unorm_c(v1, vout, ctypes.byref(vmag))
    return stypes.cVectorToPython(vout), vmag.value
Normalize a double precision 3-vector and return its magnitude.

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

    :param v1: Vector to be normalized. 
    :type v1: 3-Element Array of floats
    :return: Unit vector of v1, Magnitude of v1.
    :rtype: tuple