What books and ideas constitute the 'canon' or real Harry Potter? Is it just the seven 'big books, Philosopher's Stone to Deathly Hallows? Those books plus the school texts and Tales of Beedle the Bard? All those and everything Joanne Rowling wrote, approved, or says in talks and interviews? Or is Harry Potter canon a moving target, ever-changing, as Rowling updates it at PotterMore, the movies, and fandom understanding? John Mark Reynolds, founder of the 'Great Books' Torrey Honors Institute at Biola University, now the Provost at Houston Baptist University, and author of Chasing Shadows: Back to Barterra, is the champion of the 'Text Only' position that the books as written and published between 1997 and 2007 are the authoritative and final version of what the Hogwarts Saga and from which interpretations are to be made. Arguing from his background in Western Civilization and reading of the 'Greats,' Dr. Reynolds has argued, as an example of his position, that Dumbledore is not gay or hetero or metrosexual, no matter what Ms. Rowling says, because she didn't make the Headmaster's sexuality an issue in the books she wrote. Dr. Reynolds answers John and Keith's questions about canon in general and the several alternate positions about Harry Potter canon, as well as Harry's place in the Canon, the Western Civ 'Best Books' Greatest Hits.
He therefore had to endure over an hour of Professor Trelawney, who spent half the lesson telling everyone that the position of Mars with relation to Saturn at that moment meant that people born in July were in great danger of sudden, violent deaths.
Goblet of Fire, Chapter 20, Page 345
Shirley Henderson was aged 35 at the time that she first played Moaning Myrtle, she is the oldest actor to play a Hogwarts student in the Harry Potter films.