Craters Galilaei Origin of the name Galileo; Italian astronomer, physicist (1564-1642). When to observe it … Nearby Planitia Descensus 108 km Rima Galilaei 130 km Reiner Gamma 149 km Cavalerius 204 km Rima Cardanus 249 km Reiner 259 km Hevelius 287 km Cardanus 299 km