IIRC they were working together at the same time. The "2001" book set action around Saturn's Iapetus moon and so the screen initially was meant to follow it. Bu

IIRC they were working together at the same time. The "2001" book set action around Saturn's Iapetus moon and so the screen initially was meant to follow it. But since it was impossible to create convincing planetary rings at that time, action switches to Jupiter's Europa. And so all other Odyssey books were set there as well.