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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 Letters to a German Princess ： ウィキペディア英語版 Letters to a German Princess ''Letters to a German Princess, On Different Subjects in Physics and Philosophy'' (French: ''Lettres à une princesse d'Allemagne sur divers sujets de physique et de philosophie'') were a series of 234 letters written by the mathematician Leonhard Euler between 1760 and 1762 addressed to Friederike Charlotte of Brandenburg-Schwedt and her younger sister Louise. ==Contents== Euler started the first letter with an explanation of the concept of "size". Starting with the definition of a foot, he defined the mile and the diameter of the earth as a unit in terms of foot and then calculated the distance of the planets of the Solar System in terms of the diameter of the earth. 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「Letters to a German Princess」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.