A bill titled “The Celestial Time Standardization Act” (or HR 2313) was passed out of a House committee on April 29th. It now goes to the full House for a future floor vote. If it passes the House (and then the U.S. Senate), it would go to President Trump’s desk, where it would be signed into law.
The bill will “require the Administrator of the National Aeronautics and Space Administration to develop celestial time standardization to support future operations and infrastructure on and around the Moon and other celestial bodies other than Earth, and for other purposes.”
While this might seem silly at first, it has to do with Einstein’s general relativity theory, which says that gravity, mass and the passage of time are inextricably linked. Our Earth clocks are therefore effectively set to Earth’s gravity, while clocks on the moon would need to be set according to the much lower mass and gravity of the moon.
Time on the moon passes about 58.7 microseconds faster than on Earth, and when you’re dealing with the kind of precision required for distant communication and navigation between the lunar surface and our planet, that difference can cause actual problems:
What time is it on the moon? US House space committee wants a standard lunar clock
The U.S. House space committee moved a lunar time bill to a full House vote.
By John Loeffler, Space.com - May 5, 2025
https://www.space.com/astronomy/moon/what-time-is-it-on-the-moon-us-house-space-committee-wants-a-standard-lunar-clock