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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 Orbit of Venus ： ウィキペディア英語版 Orbit of Venus Venus has an orbit with a semimajor axis of 0.723 astronomical units (108 million kilometers), and an eccentricity of 0.007.〔Jean Meeus, ''Astronomical Formulæ for Calculators'', by Jean Meeus. (Richmond, VA: Willmann-Bell, 1988) 99. Elements by Simon Newcomb〕 Its small eccentricity and comparatively small size of the orbit give Venus the smallest range of aphelion and perihelion distances of the planets, 1.46 Gm. The planet orbits the Sun in 225 days〔The sidereal and anomalistic years are both 224.7008 days long. The sidereal year is the time taken to revolve around the Sun relative to a fixed reference frame. More precisely, the sidereal year is one way to express the rate of change of the mean longitude at one instant, with respect to a fixed equinox. The calculation shows how long it would take for the longitude to make one revolution at the given rate. The anomalistic year is the time span between successive closest approaches to the Sun. This may be calculated in the same manner as the sidereal year, but the mean anomaly is used.〕 and travels 4.54 AU in doing so,〔Jean Meeus, ''Astronomical Algorithms'' (Richmond, VA: Willmann-Bell, 1998) 238. The formula by Ramanujan is accurate enough.〕 making the average orbital speed 35 km/s. ==Changes in the orbit== The eccentricity of its orbit is declining. 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「Orbit of Venus」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.