Apollo 11 returning from the Moon had a measured trajectory in which the distance and velocity with time was recorded for over 200 hours. For each pair of distances there is an average distance and from the change in velocity an average acceleration at that distance. Here are 4 values from among many that are available:

27.7 x 106 m and -0.4553 m/ s 55.4 x 10 m and -0.122 m/ 82 96.5 x 106 m and -0.042 m S 170.4 x 106 m and -0.013 m S