def mjd2jd(mjd):
    """
    Converts Modified Julian Date to Julian Date. Definition of Modified Julian Date (MJD): MJD = JD - 2400000.5

    Parameters
    ----------
    mjd : float
        The Modified Julian Date

    Returns
    -------
    jd : float
        :math:`$mjd + 2400000.5 = jd$`, the corresponding ordinary Julian Date
    """
    return mjd + float(2400000.5)