Geological Chronicle
Desargues lies near the Moon’s northern limb, nearly due south of Pascal and southeast of Brianchon. Its position near the limb makes it appear highly elongated through foreshortening, and details are difficult to discern from Earth.
The crater has been significantly eroded and degraded over time, leaving a low, irregular rim reshaped by subsequent impacts. The rim has a notable bulge to the northeast and a lesser one along the southern edge. A ghost crater overlies the southern rim; its northern rim remains imprinted on the crater floor.
The northeastern bulge leaves low hills extending from the north and southeast, enclosing the northeastern third of the floor and suggesting an overlapping crater. A pair of craters crosses the eastern rim. The level floor was most likely resurfaced by subsequent basaltic lava flows, or by fallback and ejecta deposits; ridges and traces of former crater rims remain. Desargues M bulges into the southern rim, while Desargues A overlies the northern rim.