翻訳と辞書 Words near each other ・ Rotation around a fixed axis ・ Rotation Curation ・ Rotation flap ・ Rotation formalisms in three dimensions ・ Rotation group (disambiguation) ・ Rotation group SO(3) ・ Rotation map ・ Rotation matrix ・ Rotation method ・ Rotation Model of Learning ・ Rotation number ・ Rotation of ammunition ・ Rotation of axes ・ Rotation operator ・ Rotation operator (quantum mechanics) ・ Rotation period ・ Rotation system ・ Rotational angiography ・ Rotational bell painting ・ Rotational Brownian motion ・ Rotational Brownian motion (astronomy) ・ Rotational correlation time ・ Rotational cryptanalysis ・ Rotational diffusion ・ Rotational energy ・ Rotational invariance ・ Rotational modulation collimator ・ Rotational molding ・ Rotational mouse ・ Rotational partition function Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Rotation period ： ウィキペディア英語版 Rotation period In astronomy, the rotation period of a celestial object is the time that it takes to complete one revolution around its axis of rotation relative to the background stars. It differs from the planet's solar day, which includes an extra fractional rotation needed to accommodate the portion of the planet's orbital period during one day. ==Measuring rotation== For solid objects, such as rocky planets and asteroids, the rotation period is a single value. For gaseous/fluid bodies, such as stars and gas giants, the period of rotation varies from the equator to the poles due to a phenomenon called differential rotation. Typically, the stated rotation period for a gas giant (Jupiter, Saturn, Uranus, Neptune) is its internal rotation period, as determined from the rotation of the planet's magnetic field. For objects that are not spherically symmetrical, the rotation period is in general not fixed, even in the absence of gravitational or tidal forces. This is because, although the rotation axis is fixed in space (by the conservation of angular momentum), it is not necessarily fixed in the body of the object itself. As a result of this, the moment of inertia of the object around the rotation axis can vary, and hence the rate of rotation can vary (because the product of the moment of inertia and the rate of rotation is equal to the angular momentum, which is fixed). Hyperion, a satellite of Saturn, exhibits this behaviour, and its rotation period is described as chaotic. 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「Rotation period」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.