13. More Super granny

Taking 568/67 BC as the astronomically determined date of Nebuchadnezzar's 37th year [See Feat of Clay], Adad-guppi's numbers spot the beginning of Assurbanipal's reign in 670 BC [567+37+21+3+42]. The conventional date for his accession year is 668 BC. The difference of two years may arise from inconsistencies in granny Adad-guppi's biography.