Some related discussion:<p>From 3 months ago: "A relativistic framework to establish coordinate time on the Moon and beyond" <<a href="https://news.ycombinator.com/item?id=40934608">https://news.ycombinator.com/item?id=40934608</a>> (73 comments).<p>From 6 months ago: "White House wants Moon to have its own time zone, Coordinated Lunar Time (CLT)" <<a href="https://news.ycombinator.com/item?id=39916102">https://news.ycombinator.com/item?id=39916102</a>> (247 comments).<p>From 2 years ago: "Europe pushing for lunar time zone" <<a href="https://news.ycombinator.com/item?id=34982157">https://news.ycombinator.com/item?id=34982157</a>> (383 comments).
To wit: they want to build a Lunar GPS/GNSS nav system, and this is the time-sync part of the nav system. Lunar time runs faster than Earth TAI atomic time by 1 millisecond every 2 weeks, 21 ms per year, or 1 second every 48 years.