Constitution et évolution de l'univers

I just began to read this book. So I would (now) characterize it as a systematic study of equilibria in celestial bodies (planets, stars). The book thoroughly discusses all (I believe) cases - equilibrium of rotating solid body of uniform density, equilibrium of liquid rotating body, equilibrium of gaseous bodies - perfect as well as imperfect gas are studied, etc. This is what I managed to go through so far (not reading everything, only some parts) in the first half of the book.