Owlery The Owlery, where the school owls and the owls belonging to students live, is located on the top of West Tower. It is a circular stone room, rather cold and drafty, because none of the windows had glass in them. The floor is entirely covered in straw, owl droppings, and the regurgitated skeletons of mice and voles.
Astronomy Tower Every Wednesday night, students gather here for their Astronomy lesson. That being mentionned, it means that these poor students are exhausted the next day due to lack of sleep, unless they're insomniacs. The scientific study of matter in outer space, especially the positions, dimensions, distribution, motion, composition, energy, and evolution of celestial bodie. The Astronomy class meets at the midnight on the top tower of hogwarts.