This is the fourth time I’ve see an article about this without any giving a concrete example of a real planned experiment that would depend on this level of sensitivity. (GPS cannot be used on the moon, nor does GPS require the user to have an ultra-precise clock.)
mentions precision spatial positioning and its use for spacecraft docking, but this does not require having a separate reference clock anymore than it’s needed to use GPS at high altitudes on Earth. (Again, the GPS system does not require the user to have a high-precision clock.) They also mention the dependence of the SI units on the unit of time, which really suggests the writer has no idea how measurement precision is achieved.
The actual White House proposal
https://www.whitehouse.gov/wp-content/uploads/2024/04/Celest...
mentions precision spatial positioning and its use for spacecraft docking, but this does not require having a separate reference clock anymore than it’s needed to use GPS at high altitudes on Earth. (Again, the GPS system does not require the user to have a high-precision clock.) They also mention the dependence of the SI units on the unit of time, which really suggests the writer has no idea how measurement precision is achieved.