Cyrillus is a
lunar impact crater located on the northwest edge of
Mare Nectaris. Intruding into the northeast rim is the slightly larger, and younger crater
Theophilus. To the south is another prominent crater named
Catharina. Together these three craters form a prominent trio in the southeast quadrant of the
Moon. To the northwest is
Ibn-Rushd. Cyrillus is named after Saint
Cyril of Alexandria
Cyril of Alexandria ( grc, Κύριλλος Ἀλεξανδρείας; cop, Ⲡⲁⲡⲁ Ⲕⲩⲣⲓⲗⲗⲟⲩ ⲁ̅ also ⲡⲓ̀ⲁⲅⲓⲟⲥ Ⲕⲓⲣⲓⲗⲗⲟⲥ; 376 – 444) was the Patriarch of Alexandria from 412 to 444 ...
, 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.
* Cyrillus B — ''See''
Ibn-Rushd crater.
File:Cyrillus A crater AS14-73-10053.jpg, Cyrillus A, facing southwest, from Apollo 14
Apollo 14 (January 31, 1971February 9, 1971) was the eighth crewed mission in the United States Apollo program, the third to land on the Moon, and the first to land in the lunar highlands. It was the last of the " H missions", landings at s ...
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