Cyrillus is a

lunar Lunar most commonly means "of or relating to the Moon". Lunar may also refer to: Arts and entertainment * ''Lunar'' (series), a series of video games * "Lunar" (song), by David Guetta * "Lunar", a song by Priestess from the 2009 album ''Prior t ...

impact crater An impact crater is a circular depression in the surface of a solid astronomical object formed by the hypervelocity impact of a smaller object. In contrast to volcanic craters, which result from explosion or internal collapse, impact crater ...

located on the northwest edge of

Mare Nectaris Mare Nectaris (Latin ''nectaris'', the "Sea of Nectar") is a small lunar mare or sea (a volcanic lava plain noticeably darker than the rest of the Moon's surface) located south of Mare Tranquillitatis southwest of Mare Fecunditatis, on the near ...

. Intruding into the northeast rim is the slightly larger, and younger crater

Theophilus Theophilus is a male given name with a range of alternative spellings. Its origin is the Greek word Θεόφιλος from θεός (God) and φιλία (love or affection) can be translated as "Love of God" or "Friend of God", i.e., it is a theoph ...

. To the south is another prominent crater named Catharina. Together these three craters form a prominent trio in the southeast quadrant of the

Moon The Moon is Earth's only natural satellite. It is the fifth largest satellite in the Solar System and the largest and most massive relative to its parent planet, with a diameter about one-quarter that of Earth (comparable to the width of ...

. To the northwest is Ibn-Rushd. Cyrillus is named after Saint Cyril of Alexandria, a 4th-century Coptic Pope and theologian. The floor of Cyrillus contains a reduced central hill and the considerable crater Cyrillus A. The walls of the broken formation of Cyrillus remain intact until the point of junction with Theophilus.Moore, Patrick (2001). ''On the Moon''. Sterling Publishing Co.. . p. 81, 209 Slightly northeast of its center, three rounded mountains rise to heights of 1,000 metres above Cyrillus' floor: Cyrillus Alpha, Delta, and Eta. A tiny crater with bright rays on the east side of Cyrillus has been named Shioli.

Satellite craters

By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Cyrillus. The following craters have been renamed by the

IAU The International Astronomical Union (IAU; french: link=yes, Union astronomique internationale, UAI) is a nongovernmental organisation with the objective of advancing astronomy in all aspects, including promoting astronomical research, outreach ...

. * Cyrillus B — ''See'' Ibn-Rushd crater. File:Cyrillus A crater AS14-73-10053.jpg, Cyrillus A, facing southwest, from Apollo 14 File:Cyrillus E crater AS14-73-10047.jpg, Cyrillus E, facing southwest, from Apollo 14 File:Cyrillus G crater AS14-73-10045.jpg, Cyrillus G, facing southwest, from Apollo 14

References

Impact craters on the Moon {{Craters on the Moon: C-F