I don't get it. I haven't read the books, only seen the movies, but as far as I could tell, there's absolutely nothing special about Harry. He gets swept along, and he has himself no particular virtue to be extolled.
Physicists are notorious for approximating, and astronomers are even worse. But there are some subfields where they care about being more precise, and you maybe break the periodic table into a handful of elements plus alphas. And there's that one or two people getting exquisite spectral resolution and signal-to-noise on a few stars and measuring the abundance of Technetium or whatever.
And accepted, it appears.