Preliminary: Lunar tidal response-induced clock frequency variations on the Moon investigated in new preprint

A new preprint on arXiv investigates the influence of lunar tidal response (LTR) on lunar time, as improving clock performance makes the instability and uncertainty of clock's fractional frequency shift (FFS) comparable to the FFS caused by LTR. The study uses the Keplerian expansions method to analyze FFS to the level of 10^-18 between two clocks at different positions on the Moon, considering an elliptical orbit for the Moon.