def Morrison(Re):
    """Calculates drag coefficient of a smooth sphere using the method in
    [1]_ as described in [2]_.

    .. math::
        C_D = \\frac{24}{Re} + \\frac{2.6Re/5}{1 + \\left(\\frac{Re}{5}\\right)^{1.52}}
        + \\frac{0.411 \\left(\\frac{Re}{263000}\\right)^{-7.94}}{1
        + \\left(\\frac{Re}{263000}\\right)^{-8}} + \\frac{Re^{0.8}}{461000}

    Parameters
    ----------
    Re : float
        Particle Reynolds number of the sphere using the surrounding fluid
        density and viscosity, [-]

    Returns
    -------
    Cd : float
        Drag coefficient [-]

    Notes
    -----
    Range is Re <= 1E6.

    Examples
    --------
    >>> Morrison(200.)
    0.767731559965325

    References
    ----------
    .. [1] Morrison, Faith A. An Introduction to Fluid Mechanics.
       Cambridge University Press, 2013.
    .. [2] Barati, Reza, Seyed Ali Akbar Salehi Neyshabouri, and Goodarz
       Ahmadi. "Development of Empirical Models with High Accuracy for
       Estimation of Drag Coefficient of Flow around a Smooth Sphere: An
       Evolutionary Approach." Powder Technology 257 (May 2014): 11-19.
       doi:10.1016/j.powtec.2014.02.045.
    """
    Cd = 24.0 / Re + 2.6 * Re / 5.0 / (1 + (Re / 5.0) ** 1.52) + 0.411 * (Re /
        263000.0) ** -7.94 / (1 + (Re / 263000.0) ** -8) + Re ** 0.8 / 461000.0
    return Cd
