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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 theyfll be positioned are all questions that remain up in the air, Gramling said.
gWe have to work all of this out,h she said. gI donft think we know yet. I think it will be an amalgamation of several different things.h
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Atomic clocks, Gramling noted, are great for long-term stability, and crystal oscillators have an advantage for short-term stability.
gYou never trust one clock,h Gramling added. gAnd you never trust two clocks.h
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.
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.
But, Patla said, you get what you pay for.
gThe very cheap oscillators may be off by milliseconds or even 10s of milliseconds,h he added. gAnd that is important because for navigation purposes we need to have the clocks synchronized to 10s of nanoseconds.h
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.
(There will not, Gramling added, be different time zones on the moon. gThere have been conversations about creating different zones, with the answer: eNo,fh she said. gBut that could change in the future.h)
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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 theyfll be positioned are all questions that remain up in the air, Gramling said.
gWe have to work all of this out,h she said. gI donft think we know yet. I think it will be an amalgamation of several different things.h
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Atomic clocks, Gramling noted, are great for long-term stability, and crystal oscillators have an advantage for short-term stability.
gYou never trust one clock,h Gramling added. gAnd you never trust two clocks.h
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.
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.
But, Patla said, you get what you pay for.
gThe very cheap oscillators may be off by milliseconds or even 10s of milliseconds,h he added. gAnd that is important because for navigation purposes we need to have the clocks synchronized to 10s of nanoseconds.h
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.
(There will not, Gramling added, be different time zones on the moon. gThere have been conversations about creating different zones, with the answer: eNo,fh she said. gBut that could change in the future.h)
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eA whole different mindsetf
Accurate clockwork is one matter. But how future astronauts living and working on the lunar surface will experience time is a different question entirely.
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On Earth, our sense of one day is governed by the fact that the planet completes one rotation every 24 hours, giving most locations a consistent cycle of daylight and darkened nights. On the moon, however, the equator receives roughly 14 days of sunlight followed by 14 days of darkness.
gItfs just a very, very different concepth on the moon, Betts said. gAnd (NASA is) talking about landing astronauts in the very interesting south polar region (of the moon), where you have permanently lit and permanently shadowed areas. So, thatfs a whole other set of confusion.h
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gItfll be challengingh for those astronauts, Betts added. gItfs so different than Earth, and itfs just a whole different mindset.h
That will be true no matter what time is displayed on the astronautsf watches.
Still, precision timekeeping matters not just for the sake of scientifically understanding the passage of time on the moon but also for setting up all the infrastructure necessary to carry out missions.
The beauty of creating a time scale from scratch, Gramling said, is that scientists can take everything they have learned about timekeeping on Earth and apply it to a new system on the moon.
And if scientists can get it right on the moon, she added, they can get it right later down the road if NASA fulfills its goal of sending astronauts deeper into the solar system.
gWe are very much looking at executing this on the moon, learning what we can learn,h Gramling said, gso that we are prepared to do the same thing on Mars or other future bodies.h
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