I'm just reading the latest Harry Potter book (OK, maybe not quit the right forum then), and have come across some Bad Astronomy.

Harry has to take a load of exams, including Astronomy, during the summer term - though it's never made entirely clear why it's important for young witches and wizards to learn astronomy (from the point of view of their magical studies that is).

Anyway, their exams include an astronomy practical which takes place at night and involves identifying and marking the positions of various celestial objects on a star chart and here's the rub; Hogwarts School is about a day's journey by train north of London, putting it somewhere in Northern Scotland. It barely gets dark up there in June, so astronomy, even at 11pm will be a challenge and spotting Venus and Orion, as Harry does, will be nigh on impossible at that time of day/year.

But then he may have a magical telescope (previous homework has included drawing the moons of Jupiter) so what do I know.