Calculations show longitude and latitude differences between clocks change their lunar tidal fractional frequency shifts, with Moon longitude affecting phase and amplitude.
The IAU Resolutions on Astronomical Reference Systems, Time Scales, and Earth Rotation Models
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abstract
Recent resolutions passed by the International Astronomical Union (IAU) on astronomical reference systems, time scales, and Earth rotation models are the most significant set of international agreements in positional astronomy in several decades. These resolutions, the result of over ten years of international research and study, provide a coherent set of foundational standards for the treatment of astrometric data and the modeling of dynamics in the solar system. This circular explains these resolutions and provides a complete set of practical formulas for their implementation. The six main chapters cover relativity, time scales, the fundamental celestial reference system, ephemerides of solar system bodies, precession and nutation, and modeling the Earth's rotation.
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The influence of lunar tidal potential on clock frequencies at different positions on Earth
Calculations show longitude and latitude differences between clocks change their lunar tidal fractional frequency shifts, with Moon longitude affecting phase and amplitude.