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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 crater Cyrillus to the southwest. To the east is the smaller crater Mädler and further to the south-southeast is Beaumont.〔(【引用サイトリンク】 work=astrosurf.com )〕 It was named after the 4th-century Coptic Pope Theophilus of Alexandria.〔''Autostar Suite Astronomer Edition''. CD-ROM. Meade, April 2006.〕 Theophilus, Cyrillus and Catharina form a prominent group of large craters visible on the terminator 5 days after the new moon. The rim of Theophilus has a wide, terraced inner surface that shows indications of landslips. It is 14,000 feet deep with massive walls and has broken into a second formation, Cyrillus.〔Moore, Patrick (2001). ''On the Moon''. Sterling Publishing Co.. ISBN 0-304-35469-4.〕 It was created during the Eratosthenian period, from 3.2 to 1.1 billion years ago. It has an imposing central mountain, 1,400 meters high, with four summits.〔 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 Theophilus.〔(【引用サイトリンク】 work=Lunar and Planetary Institute )〕 ==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 Theophilus. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Theophilus (crater)」の詳細全文を読む スポンサード リンク
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