The idea of Moon standard time would help with the idea of Moonlight, which is an ESA satellite constellation that could provide positioning, communication, and navigation data to astronauts on the lunar surface. The problem now is that different missions to the Moon have all used a different clock, even if it was standardized to Earth time and corrected for gravitational drifts in time. Now, with more missions than ever planned to work on the Moon—many of which will overlap and need to communicate with each other—a standard Moon time is crucial.