MoogProg t1_j60l2cw wrote on January 26, 2023 at 9:28 PM

Reply to comment by rocketsocks in What time is it on the Moon? - Satellite navigation systems for lunar settlements will require local atomic clocks. Scientists are working out what time they will keep. by speckz

Well, it would be sync'd to UT/GMT but there will be differences in actual time between the two frames of reference. Set the Moon clock to UT/GMT running the same method of timekeeping as Geneva, they will drift apart from each other due to the relativistic effects of gravity. How that gets negotiated will be interesting. The Moon and Mars have their own time, no matter what 'zone' we apply to keep track of things. Crazy stuff.

Eli_eve t1_j612ynt wrote on January 26, 2023 at 11:25 PM

I read an estimate of about 22 milliseconds per year time difference between Earth and Moon due to relativistic effects. Which is about 1 second every 45 years or so. Probably just an easy leap second every half century.