A cumulative plot of the approximate ages of lunar craters larger than D  >  20 km, according to K. Terada et al. (2020). The chronology used is provided in the text. The sample-derived age of Copernicus (blue dot) is 800 Ma, and it serves as our calibration point. The sample-derived ages of Aristillus and Autolycus (green dots) 1400  ±  60 Myr and 1940  ±  10 Myr, respectively, match the model ages of 1510  ±  140 Myr and 1930  ±  190 Myr, respectively. The craters with red dots have nearly the same N(1) values as Copernicus. They serve as our baseline for how the Eulalia impact shower affected the Moon.