Jared
Your mother had the matter broadly correct when she established the pivotal date 539 based on secular evidence but failed to mention that 607 is then calculated from the release of the exiles under by Cyrus in 537. One counts back seventy years to 607 for the fall of Jerusalem. These events concern rulership and its otherthrow and in fulfillment of the seven times which began in 607 which marked the end of the Davidic kingdom until it was restored with Messianic kingdom in 1914. The seven times is a prophetic period of 2520 years and is counted fro 607 until 1914.
The subject is a fascinating one and has attracted much interest over the centuries by many expositors based upon by a revealed and secular accurate chronology. Most of the postings on this subject are simply false and misleading because these cannot give you an exact date for the fall of Jerusalem as either 586 or 587 nor is there any consistent interpretation of the seventy years. The proponents of such a false chronology have created a mire of confusion which is devoid of any prophetic implications In contast, the biblical chronolgy is simple and easily understood and thus constitutes a proper basis for faith as the hallmark of true Christianity.
Be assured Mom knows best and you would be very wise if you used the Society.s explanation on chronology and prophecy and compared this current orthodoxy.
scholar
BA BA Hons (cand.) MA Studies in Religion