What time is it on the moon?
Since the dawn of the Space Age, the answer
has been: It depends. For decades, lunar missions have operated on the time of
the country that launched them. But with several lunar explorations heading for
the launchpad, the European Space Agency has deemed the current system
unsustainable.
اضافة اعلان
The solution, the agency said last week, is a
lunar time zone.
“ESA is not taking the lead on this discussion;
we’re just putting a finger on a problem we need to tackle,” said Brice
Dellandrea, an engineer with the ESA. “But this is the kind of topic that needs
international coordination and consensus.”
The main objective of establishing a universal
timekeeping system for the moon, the ESA said, is to streamline contact among
the various countries and entities, public and private, that are coordinating
trips to and around the moon.
“This idea of timekeeping on the moon is important because it shows the international development of the moon… Precision timekeeping was key to navigation on the Earth, and it’s key to navigation between the Earth and the moon.”
The discussion about how to do that is
happening as things are starting to get busy on and above the lunar surface.
International interstellar missionsThe M1 lunar lander built by the Japanese
company Ispace is set to arrive on the moon in April, when it will try to
deploy a rover built by the United Arab Emirates; a robot built by Japan’s
space agency, JAXA; and other payloads.
A six-legged cylindrical robot called the
Nova-C lander, built by the Houston-based company Intuitive Machines, is
expected to launch on SpaceX’s Falcon 9 and land on the South Pole of the moon
in June. Additional uncrewed missions will land by the end of the year,
according to Jack Burns, director of the Network for Exploration and Space
Science at the University of Colorado, Boulder.
Those missions, among other possible lunar
landings, are happening as NASA prepares to send four astronauts into orbit
around the moon next year. That mission will pave the way for the first crewed
moon landing since Apollo 17 in December 1972, currently planned for 2025.
“We’re going to be an exploration civilization in which we’re going to be exploring beyond Earth’s orbit. We’re going to be going to the moon and then, after that, to Mars.”
The European Space Agency (ESA), meanwhile, is
contributing to NASA’s effort to build the Gateway lunar station, which will
serve as a way station for future crews on their way to the lunar surface. Last
year, China completed construction of its own space station and previously
hinted that Chinese astronauts would be on the moon by 2030. South Korea
launched its own lunar spacecraft, Danuri, on a SpaceX Falcon rocket from
Florida in August. It joined India’s Chandrayaan-2 mission, as well as
spacecraft from NASA and China, in its orbit of the moon.
Getting the timing rightWith increased exploration comes the potential
for miscommunication.
“These missions will not only be on or around
the moon at the same time, but they will often be interacting as well —
potentially relaying communications for one another, performing joint
observations or carrying out rendezvous operations,” the ESA said in a
statement.
For all those interactions to happen smoothly,
the missions will need to operate on a standardized time, the agency said.
“This idea of timekeeping on the moon is
important because it shows the international development of the moon,” Burns
said. “Precision timekeeping was key to navigation on the Earth, and it’s key
to navigation between the Earth and the moon.”
A matter of microsecondsThe ESA said that a universal timekeeping
system for the moon is needed, but that many details remain to be worked out.
One of the questions that has yet to be settled, the agency said, was whether
lunar time should be set on the moon or synchronized with Earth.
Time on Earth is precisely tracked by atomic
clocks, but synchronizing time on the moon is tricky because clocks run faster
there, gaining around 56 microseconds, or millionths of a second, per day.
Once a new lunar time zone is established, the
methods used to create it will be useful for future space exploration, Burns
said. Astronauts could go to Mars in the next two to three decades, he said,
and will face similar logistical hurdles that a Martian time zone could
address.
“We’re going to be an exploration civilization
in which we’re going to be exploring beyond Earth’s orbit,” Burns said. “We’re
going to be going to the moon and then, after that, to Mars.”
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