ASTRONOMY
Astronomy is the only field of study at Hogwarts which has a direct equivalent in the Muggle world. Astronomy classes take place in the Astronomy Tower, the tallest tower in Hogwarts. Lessons involve observations of the night skies with telescopes. No Astronomy lesson, or even a fragment of one, is ever depicted in the movies. Known student homework activities include learning the names of stars, constellations and planets, as well as their location and movements, and describing the environments of planets and moons.
SINISTRA IN THE BOOKS
Aurora Sinistra is the teacher of Astronomy in Hogwarts School of Witchcraft and Wizardry. Although Astronomy is a compulsory subject for students of all years at Hogwarts, the character remains obscure and appears extremely rarely in the books.
Professor Sinistra's first appearance is in Harry Potter and the Chamber of Secrets, helping to move a petrified Justin Finch-Fletchley to the hospital wing. The genderless title of "Professor" and the lack of any description of the character or lines for him or her to say prevented us from knowing even Sinistra's gender. The character does not appear again in the book.
Sinistra appears again at the beginning of Harry Potter and the Goblet of Fire when the teachers' table is described and again during the Yule Ball, dancing a nervous two-step with (a presumed) Professor Moody. From that it can be deduced that Professor Sinistra is a witch rather than a wizard. This deduction was corraborated by JK Rowling's representatives when the Portugese translators need to know her gender.
Professor Sinistra holds her classes every Wednesday at midnight on the top of the Astronomy Tower of Hogwarts, since it is the tallest tower of the castle and offers the best view of the night sky. The Astronomy Tower is otherwise out of bounds for students.
- From the Harry Potter Wiki
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