There's been a resurgence of interest in the moon, now that we're getting closer to re-establishing a foothold on the celestial body. Space agencies and private companies around the world have been scheduling their own lunar missions to take place over the coming years, and it will be quite complicated having to coordinate with each other when they use different time zones. During a meeting at the European Space Agency's ESTEC technology center in the Netherlands last year, space organizations talked about the "importance and urgency of defining a common lunar reference time." In a new announcement, ESA navigation system engineer Pietro Giordano said a "joint international effort is now being launched towards achieving this."