|
||||||||
|
qui montre des éboulements. L'extérieur a un rempart large et torturé. Sur le mur Nord-ouest repose Theophilus B (8 Km). Le plancher du cratère est relativement plat avec une quadruple crête centrale qui s'élève à une hauteur d'environ 2 kilomètres. Les pentes Ouest de ces pics sont plus larges et plus irrégulières, tandis que les crêtes descendent plus brusquement sur les cotés nordiques et occidentaux. Cyrillus est un cratère de 98 Km et profond de 3600 m. Situé sur le bord nord-ouest de la mer du Nectar. Il forme avec Catherina et Theophilus un célèbre trio dont il occupe la position intermédiaire. Theophilus plus jeune a fait disparaître entièrement le mur nord-est de Cyrillus. Au sud-est de Cyrillus on trouve les restes usés du cratère Cyrillus F (44km). Au nord-ouest le cratère Ibn Rushd (33 Km). Les murs du cratère Cyrillus ont été érodés. Le plancher est rugueux et irrégulier, avec trois crêtes centrales distinctes excentrées légèrement au nord-est. Une paire de fissures incurvées se trouve au sud-ouest et à l'ouest des crêtes centrales. Le petit cratère Cyrillus A a impacté le mur intérieur au sud-ouest, versant le plus tourmenté. Ibn Rushd est une formation circulaire abîmée. Versants plus escarpés à l'Est et portant Cyrillus C au Sud. Le fond est plat rempli de lave criblé de Craterlets.
|
||||||||
|
Theophilus is a prominent lunar impact crater that lies between Sinus Asperitatis in the north and Mare Nectaris to the southeast. It partially intrudes into the comparably-sized Cyrillus crater to the southwest. To the east is the smaller Mädler crater and further to the south-southeast is Beaumont crater. To the west-northwest is Mons Penck, a peak forming a promontory arm on the Rupes Altai. The Rev. T. W. Webb described this as "the deepest of all visible craters". The rim of Theophilus crater has a wide, terraced inner surface that shows indications of landslips. The exterior has a wide, wrinkled rampart that descends about 1.4 kilometers to the surrounding maria. The largest impact crater of signifance on the wall is the small Theophilus B on the inside of the northwest rim. Most of the rays from this crater has been weathered away, although a few are still visible. The floor of the crater is relatively flat, and it has a large, triple-peaked central crater that climbs to a height of about 2 kilometers above the floor. The western peak is designated Psi (ψ), the eastern Phi (φ), and the northern peak is Alpha (α) Theophilus. The western slopes of this ridge are wider and more irregular, whereas the peaks descend more sharply to the floor on the northern and western faces. The Apollo 16 mission collected several pieces of basalt that are believed to be ejecta from the formation of the Theophilus crater. |
|
|||||||
|
Cyrillus is a lunar impact crater located on the northwest edge of Mare Nectaris. Intruding into the northeast rim is the equally-large, and younger Theophilus crater. 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 southeast of Cyrillus is the heavily-worn remains of the crater Cyrillus F. To the northwest is Ibn-Rushd crater. The rim of Cyrillus crater has been eroded, although it remains intact except where overlaid by Theophilus crater. The floor is rough and irregular, with three distinct central peaks offset slightly to the northeast. The western peak is designated Alpha (α), the eastern Eta (η), and the southern peak Delta (δ) Cyrillus. A pair of curved clefts lie to the southwest and west of the central peaks. The small crater 'Cyrillus A' lies on the inner wall of the east-southeast rim.
|
||||||||
(English version,
