Dear Eye View
How do the astronauts onboard the International Space Station know when to celebrate New Year’s? They’re hurtling through time zones at 17,500 miles per hour! Hardly time for a toast.
They go by Greenwich Mean Time. By convention, the ISS astronauts set their clocks to ring in the New Year with those in London, Reykjavik, and Accra. The crew of the space station may also exchange holiday greetings with mission controllers in Moscow and Houston at the local midnights in those two places—9 p.m. and 6 a.m. GMT, respectively. Though Sinapore isn’t too bad either.