These experiments have also been useful in improving the ephemeris detailing of the Earth-Moon system's orbit about the Sun, and long-term studies of variations in the Earth's rotation and polar recession.
(These experiments; have also been; useful) (the ephemeris; detailing; of the Earth-Moon system's orbit about the Sun)
These experiments the ephemeris
have also been detailing
useful
of the Earth-Moon system's orbit about the Sun