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 > Lunar clockwork 
> What scientists know for certain is that they need to get precision timekeeping instruments to the moon. 
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> Exactly who pays for lunar clocks, which type of clocks will go, and where they’ll be positioned are all questions that remain up in the air, Gramling said. 
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> “We have to work all of this out,” she said. “I don’t think we know yet. I think it will be an amalgamation of several different things.” 
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> Atomic clocks, Gramling noted, are great for long-term stability, and crystal oscillators have an advantage for short-term stability. 
> “You never trust one clock,” Gramling added. “And you never trust two clocks.” 
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> Clocks of various types could be placed inside satellites that orbit the moon or perhaps at the precise locations on the lunar surface that astronauts will one day visit. 
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> As for price, an atomic clock worthy of space travel could cost around a few million dollars, according Gramling, with crystal oscillators coming in substantially cheaper. 
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> But, Patla said, you get what you pay for. 
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> “The very cheap oscillators may be off by milliseconds or even 10s of milliseconds,” he added. “And that is important because for navigation purposes — we need to have the clocks synchronized to 10s of nanoseconds.” 
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> A network of clocks on the moon could work in concert to inform the new lunar time scale, just as atomic clocks do for UTC on Earth. 
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> (There will not, Gramling added, be different time zones on the moon. “There have been conversations about creating different zones, with the answer: ‘No,’” she said. “But that could change in the future.”)
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