From the Earth to the Moon Chapter 4 - Reply From the Observatory of Cambridge

In which the esteemed members of the Gun Club, led by President Barbicane, earnestly seek the counsel of learned astronomers at Cambridge to elucidate the celestial mechanics and precise conditions necessary for propelling a projectile to the moon. Through meticulous examination, the Cambridge Observatory furnishes detailed calculations of distance, trajectory, and timing, advising on the optimal moment and manner to launch their extraordinary experiment.