The agency said this week that its counterparts around the world are considering how best to measure time on the Moon. The idea was raised during a meeting in the Netherlands last year, and the participants agreed on the urgency of establishing “a common lunar time of reference”.
For the moment, a lunar mission uses the time of the country that organizes it. European space officials believe that a lunar time zone recognized and accepted by all would simplify life for everyone, at a time when more and more countries and even private companies hope to visit the Moon.
The American space agency, NASA, had encountered this problem when designing and building the International Space Station, the first module of which will soon be 25 years old.
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Although the station does not have its own time zone, it uses Coordinated Universal Time which depends on ultra-accurate atomic clocks. This helps to share the time difference between Canada and the United States on one side, and on the other the Russian, Japanese and European programs that participate in the station.
The researchers will also have to overcome technical problems. Clocks move faster on the Moon than on Earth, gaining regarding 56 microseconds a day, according to the space agency. Complicating matters further, clocks don’t work the same way in orbit around the Moon as they do on lunar soil.
But more than anything, lunar time will have to be practical for the astronauts who will be using it. NASA hopes to send humans to visit the Moon next year and land there in 2025.
A lunar day can last up to 29.5 Earth days, so the challenge is daunting. The system invented for the Moon might then be applied to the other planets.
