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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Theon Junior (crater) ： ウィキペディア英語版 Theon Junior (crater) Theon Junior is a lunar impact crater that is located just to the west-southwest of the crater Delambre. It forms a matching pair with Theon Senior, only a couple of crater diameters to the north-northwest. The crater is circular and bowl-shaped, with a small floor at the bottom of the high, sloping interior walls. It is named for Theon of Alexandria, a 4th-century Greek astronomer and mathematician. The crater is from the Eratosthenian period, which lasted from 3.2 to 1.1 billion years ago. It is 17 kilometers in diameter and the difference in height at its rim and its deepest part is 3,580 meters.〔''Autostar Suite Astronomer Edition''. CD-ROM. Meade, April 2006.〕〔Moore, Patrick (2001). ''On the Moon''. Sterling Publishing Co.. ISBN 0-304-35469-4.〕 ==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 Theon Junior. 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「Theon Junior (crater)」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.