What time is it on the moon?
Well, right now, that’s somewhat a matter of interpretation. But humanity is going to need to get a lot more specific if it intends to permanently set up shop there. In preparation, NASA is aligning its clocks in preparation for the upcoming Artemis missions. On Tuesday, the White House issued a memo directing the agency to establish a Coordinated Lunar Time (LTC), which will help guide humanity’s potentially permanent presence on the moon. Like the internationally recognized Universal Time Zone (UTC), LTC will lack time zones, as well as a Daylight Savings Time.
It’s not quite a time zone like those on Earth, but an entire frame of time reference for the moon.
As Einstein famously noted, time is very much relative. Most timekeeping on Earth is tied to Coordinated Universal Time (UTC), which relies on an international array of atomic clocks designed to determine the most precise time possible. This works just fine in relation to our planet’s gravitational forces, but thanks to physics, things are observed differently elsewhere in space, including on the moon.
“Due to general and special relativity, the length of a second defined on Earth will appear distorted to an observer under different gravitational conditions, or to an observer moving at a high relative velocity,” Arati Prabhakar, Assistant to the President for Science and Technology and Director at the Office of Science and Technology Policy (OSTB), explained in yesterday’s official memorandum.
Because of this, an Earth-based clock seen by a lunar astronaut would appear to lose an average of 58.7 microseconds per Earth day, alongside various other periodic variational influences. This might not seem like much, but it would pose major issues for any future lunar spacecraft and satellites that necessitate extremely precise timekeeping, synchronization, and logistics.
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