3 ms·

>due to relativistic effects, events that appear simultaneous at the Earth (e.g., the start of a broadcast signal) are not simultaneous to an observer at the Mo

• CuriousCosmic 3y ago
  It's true for exactly the same reason. You have - TAI: i.e. Atomic time which is basically the aggregate of a bunch of major atomic clocks to get as close as possible to "true time" on earh. - UT: i.e. Universal Time on earth with the different UT0, UT1, etc providing different levels of correction based on where you are on earth. - UTC: i.e. coordinated time that is the same anywhere on earth. This is derived from TAI but receives leap seconds when it is sufficiently out of sync from UT1. - GPS time: i.e. the specific time standard kept on GPS satellites based on their orbit. This time is derived from UTC(UNSO) which is a specific UTC clock at the US Naval Observatory and the offsets are recorded by the satellites. So you have your GPS time and your UTC time. What this proposal is doing is effectively the same thing. i.e. creating a new coordinated time standard for the moon (LTC) that tracks an offset of how far it's drifted from UTC so you can effectively coordinate. And eventually when the moon gets it's own GPS (which it will eventually), you'll have GPS(LTC), i.e. GPS time relative to LTC.