Good points. I guess if Senenmut had to consult records, as opposed to being an eyewitness of the "event" in 1534, the value of the astronomical ceiling is diminished. For the "snapshot" could be of some special day long before Senenmut or his contemporaries were born. Without something to fix the day to the lifetime of Senenmut, an advocate of the standard accession date of 1479 for Tut III will see no reason to re-date anything. For New Moon dates, there are more possibilities that allow the Egyptian chronology to agree with a 17th century eruption. I know Bietak is not part of the team of scientists who have dated the eruption scientifically. Skyview Café and Civil 4 show that psDntyw on II-Peret 30 fell on 8-Mar in 1530 BCE (Julian) = Year 24 Tut III in my chronology. In Year 23 psDntyw fell on I-Shemu 21 fell on 28-May, 1532 BCE. Accession on III-Shemu 9.
Regards,
Tory