Craters Gassendi Origin of the name Pierre; French astronomer, mathematician (1592-1655). When to observe it … Nearby Rimae Gassendi 4 km Rimae Herigonius 145 km Dorsa Ewing 203 km Rimae Mersenius 211 km Mare Humorum 214 km Herigonius 216 km Letronne 226 km Dorsa Rubey 243 km