def F_to_nu(F, ecc):
    """True anomaly from hyperbolic eccentric anomaly.

    Parameters
    ----------
    F : ~astropy.units.Quantity
        Hyperbolic eccentric anomaly.
    ecc : ~astropy.units.Quantity
        Eccentricity (>1).

    Returns
    -------
    nu : ~astropy.units.Quantity
        True anomaly.

    """
    return (F_to_nu_fast(F.to_value(u.rad), ecc.value) * u.rad).to(F.unit)