Geological Chronicle
Boole sits on the northwestern limb of the Moon, northwest of the crater Gerard and south of Cremona. Because of its peripheral position, observers view the formation nearly from the side, where foreshortening compresses its 61.34-kilometer diameter into an oblong profile. Ground-based observation requires a favorable lunar libration a day or two before a full moon.
The crater formation itself is nearly circular, surrounded by a wide inner wall rounded by subsequent impacts. Its interior floor remains relatively flat and marked only by tiny craterlets. Along the southern rim, the eroded and distorted satellite crater Boole E attaches to the main formation, creating a saddle-shaped valley between the two structures.
Along the western face of Boole, a multitude of small craterlets extends northward toward Brianchon, forming a short crater chain near the western rim. The International Astronomical Union officially adopted the designation Boole in 1964 to honor English mathematician George Boole, following its introduction in the 1963 Rectified Lunar Atlas.