-From page 127 of Eric Michael Wilson's book:
"Exactly how accurate is the timing of planatary orbits? They are so accurate and so predictable that scientists have been able to create algorithms which will allow us to know exactly where each planet in the solar system was at any time in recorded history. In fact, there is an excellent app that you can download and run on your smartphone or tablet called SkySafari 6 Plus, which is available on the web or from the Apple and Android stores. With it, you can see precisely where a particular planet described on VAT 4956 was in the sky on a given date to see if the positions match. If they match, then the data on VAT 4956 are proven to be accurate .
"I would recommend you download it yourself so you can do your own research. Make sure you get the Plus version of the app as the cheaper version does not allow calculations for years before Christ."