Forums General Discussion Crew Dragon launch Causality

Dr Paul Leyland

“launching astronauts to the International Space Station on Crew Dragon at 21.32 on May 27th”; “The UK has an ISS pass at 21.20,”; “and the[n] go into garden to wave them on there [sic] way.”

Am I missing something?  How do I subsequently wave at the crew 12 minutes before they leave the Earth?