Interesting, Marianne. Here's another Website on Senenmut's astronomical ceiling:
http://www.anistor.gr/english/enback/v021.htm .
I don't see the connection you're making between "year 7" and the year 1534 BC, though. I take it only that Senenmut was something like 30 years older than Hatshepsut, nothing more.
George R.