To me, astronomy is the study of the universe and everything in it. This includes the planets, moons, stars, comets, etc. The major difference found between Muggle astronomy and Wizarding astronomy is that the Muggle world has "laws" that explain what they see in the universe. The study of these laws of the universe in the Muggle world is called "physics". Although these laws do explain a vast majority of what the Muggles see on Earth and in the universe, it may not hold true in the Wizarding world.
Section B
Mercury
Mercury lacks an atmosphere. As a result, the planet experiences wild temperature swings.
Mercury's magnetic field is about 1/100th that of Earth's magnetic field. The magnetic field is generated by the planet's core.
Venus
Section B
Mercury
Mercury lacks an atmosphere. As a result, the planet experiences wild temperature swings.
Mercury's magnetic field is about 1/100th that of Earth's magnetic field. The magnetic field is generated by the planet's core.
Venus